[feat] Add Jekyll, and layout artifacts.

This commit adds the Jekyll configuration as well as the
layout HTML / SASS / JS / etc. to make AIPs look good.

Author: Luke Sneeringer

Gemfile

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+source "https://rubygems.org" do
+  gem "jekyll"
+  gem "github-pages", group: :jekyll_plugins
+end

Gemfile.lock

@@ -0,0 +1,249 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    activesupport (4.2.10)
+      i18n (~> 0.7)
+      minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
+      tzinfo (~> 1.1)
+    addressable (2.5.2)
+      public_suffix (>= 2.0.2, < 4.0)
+    coffee-script (2.4.1)
+      coffee-script-source
+      execjs
+    coffee-script-source (1.11.1)
+    colorator (1.1.0)
+    commonmarker (0.17.13)
+      ruby-enum (~> 0.5)
+    concurrent-ruby (1.1.5)
+    dnsruby (1.61.2)
+      addressable (~> 2.5)
+    em-websocket (0.5.1)
+      eventmachine (>= 0.12.9)
+      http_parser.rb (~> 0.6.0)
+    ethon (0.12.0)
+      ffi (>= 1.3.0)
+    eventmachine (1.2.7)
+    execjs (2.7.0)
+    faraday (0.15.4)
+      multipart-post (>= 1.2, < 3)
+    ffi (1.10.0)
+    forwardable-extended (2.6.0)
+    gemoji (3.0.0)
+    github-pages (197)
+      activesupport (= 4.2.10)
+      github-pages-health-check (= 1.16.1)
+      jekyll (= 3.7.4)
+      jekyll-avatar (= 0.6.0)
+      jekyll-coffeescript (= 1.1.1)
+      jekyll-commonmark-ghpages (= 0.1.5)
+      jekyll-default-layout (= 0.1.4)
+      jekyll-feed (= 0.11.0)
+      jekyll-gist (= 1.5.0)
+      jekyll-github-metadata (= 2.12.1)
+      jekyll-mentions (= 1.4.1)
+      jekyll-optional-front-matter (= 0.3.0)
+      jekyll-paginate (= 1.1.0)
+      jekyll-readme-index (= 0.2.0)
+      jekyll-redirect-from (= 0.14.0)
+      jekyll-relative-links (= 0.6.0)
+      jekyll-remote-theme (= 0.3.1)
+      jekyll-sass-converter (= 1.5.2)
+      jekyll-seo-tag (= 2.5.0)
+      jekyll-sitemap (= 1.2.0)
+      jekyll-swiss (= 0.4.0)
+      jekyll-theme-architect (= 0.1.1)
+      jekyll-theme-cayman (= 0.1.1)
+      jekyll-theme-dinky (= 0.1.1)
+      jekyll-theme-hacker (= 0.1.1)
+      jekyll-theme-leap-day (= 0.1.1)
+      jekyll-theme-merlot (= 0.1.1)
+      jekyll-theme-midnight (= 0.1.1)
+      jekyll-theme-minimal (= 0.1.1)
+      jekyll-theme-modernist (= 0.1.1)
+      jekyll-theme-primer (= 0.5.3)
+      jekyll-theme-slate (= 0.1.1)
+      jekyll-theme-tactile (= 0.1.1)
+      jekyll-theme-time-machine (= 0.1.1)
+      jekyll-titles-from-headings (= 0.5.1)
+      jemoji (= 0.10.2)
+      kramdown (= 1.17.0)
+      liquid (= 4.0.0)
+      listen (= 3.1.5)
+      mercenary (~> 0.3)
+      minima (= 2.5.0)
+      nokogiri (>= 1.8.5, < 2.0)
+      rouge (= 2.2.1)
+      terminal-table (~> 1.4)
+    github-pages-health-check (1.16.1)
+      addressable (~> 2.3)
+      dnsruby (~> 1.60)
+      octokit (~> 4.0)
+      public_suffix (~> 3.0)
+      typhoeus (~> 1.3)
+    html-pipeline (2.10.0)
+      activesupport (>= 2)
+      nokogiri (>= 1.4)
+    http_parser.rb (0.6.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
+    jekyll (3.7.4)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
+      em-websocket (~> 0.5)
+      i18n (~> 0.7)
+      jekyll-sass-converter (~> 1.0)
+      jekyll-watch (~> 2.0)
+      kramdown (~> 1.14)
+      liquid (~> 4.0)
+      mercenary (~> 0.3.3)
+      pathutil (~> 0.9)
+      rouge (>= 1.7, < 4)
+      safe_yaml (~> 1.0)
+    jekyll-avatar (0.6.0)
+      jekyll (~> 3.0)
+    jekyll-coffeescript (1.1.1)
+      coffee-script (~> 2.2)
+      coffee-script-source (~> 1.11.1)
+    jekyll-commonmark (1.2.0)
+      commonmarker (~> 0.14)
+      jekyll (>= 3.0, < 4.0)
+    jekyll-commonmark-ghpages (0.1.5)
+      commonmarker (~> 0.17.6)
+      jekyll-commonmark (~> 1)
+      rouge (~> 2)
+    jekyll-default-layout (0.1.4)
+      jekyll (~> 3.0)
+    jekyll-feed (0.11.0)
+      jekyll (~> 3.3)
+    jekyll-gist (1.5.0)
+      octokit (~> 4.2)
+    jekyll-github-metadata (2.12.1)
+      jekyll (~> 3.4)
+      octokit (~> 4.0, != 4.4.0)
+    jekyll-mentions (1.4.1)
+      html-pipeline (~> 2.3)
+      jekyll (~> 3.0)
+    jekyll-optional-front-matter (0.3.0)
+      jekyll (~> 3.0)
+    jekyll-paginate (1.1.0)
+    jekyll-readme-index (0.2.0)
+      jekyll (~> 3.0)
+    jekyll-redirect-from (0.14.0)
+      jekyll (~> 3.3)
+    jekyll-relative-links (0.6.0)
+      jekyll (~> 3.3)
+    jekyll-remote-theme (0.3.1)
+      jekyll (~> 3.5)
+      rubyzip (>= 1.2.1, < 3.0)
+    jekyll-sass-converter (1.5.2)
+      sass (~> 3.4)
+    jekyll-seo-tag (2.5.0)
+      jekyll (~> 3.3)
+    jekyll-sitemap (1.2.0)
+      jekyll (~> 3.3)
+    jekyll-swiss (0.4.0)
+    jekyll-theme-architect (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-cayman (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-dinky (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-hacker (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-leap-day (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-merlot (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-midnight (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-minimal (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-modernist (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-primer (0.5.3)
+      jekyll (~> 3.5)
+      jekyll-github-metadata (~> 2.9)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-slate (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-tactile (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-time-machine (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-titles-from-headings (0.5.1)
+      jekyll (~> 3.3)
+    jekyll-watch (2.1.2)
+      listen (~> 3.0)
+    jemoji (0.10.2)
+      gemoji (~> 3.0)
+      html-pipeline (~> 2.2)
+      jekyll (~> 3.0)
+    kramdown (1.17.0)
+    liquid (4.0.0)
+    listen (3.1.5)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
+    mercenary (0.3.6)
+    mini_portile2 (2.4.0)
+    minima (2.5.0)
+      jekyll (~> 3.5)
+      jekyll-feed (~> 0.9)
+      jekyll-seo-tag (~> 2.1)
+    minitest (5.11.3)
+    multipart-post (2.0.0)
+    nokogiri (1.10.1)
+      mini_portile2 (~> 2.4.0)
+    octokit (4.13.0)
+      sawyer (~> 0.8.0, >= 0.5.3)
+    pathutil (0.16.2)
+      forwardable-extended (~> 2.6)
+    public_suffix (3.0.3)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
+    rouge (2.2.1)
+    ruby-enum (0.7.2)
+      i18n
+    ruby_dep (1.5.0)
+    rubyzip (1.2.2)
+    safe_yaml (1.0.5)
+    sass (3.7.3)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    sawyer (0.8.1)
+      addressable (>= 2.3.5, < 2.6)
+      faraday (~> 0.8, < 1.0)
+    terminal-table (1.8.0)
+      unicode-display_width (~> 1.1, >= 1.1.1)
+    thread_safe (0.3.6)
+    typhoeus (1.3.1)
+      ethon (>= 0.9.0)
+    tzinfo (1.2.5)
+      thread_safe (~> 0.1)
+    unicode-display_width (1.5.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  github-pages!
+  jekyll!
+
+BUNDLED WITH
+   2.0.1

README.md

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+# API Improvement Proposals
+
+## What are AIPs?
+
+AIP stands for **API Improvement Proposal**, which is a design document
+providing high-level, concise documentation for API development. They are to
+serve as the source of truth for API-related documentation at Google and the
+means by which API teams discuss and come to consensus on API guidance.
+
+## Reading AIPs
+
+The easiest way to read AIPs is using GitHub Pages: [aip.dev](https://aip.dev).
+If you prefer, you can also read the source files, which are in this repository
+in the [`aip/`](https://github.com/googleapis/aip/tree/master/aip) directory.
+
+## Proposing / Contributing
+
+We would be happy to consider proposals. In order to propose a new AIP, start
+by [opening an issue](https://github.com/googleapis/aip/issues). If there is
+general interest and it comes time to draft an actual proposal, consult our
+[contributing guide](./CONTRIBUTING.md).
+
+## License
+
+Except as otherwise noted, the content of this repository is licensed under the
+[Creative Commons Attribution 4.0 License][1], and code samples are licensed
+under the [Apache 2.0 License][2].
+
+For the full text of each license, see [`LICENSE.md`](./LICENSE.md). For
+additional details, see the developer.google.com [Site Policies][3].
+
+[1]: https://creativecommons.org/licenses/by/4.0/
+[2]: https://www.apache.org/licenses/LICENSE-2.0
+[3]: https://developers.google.com/terms/site-policies

_config.yml

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+---
+markdown: kramdown
+plugins:
+  - jekyll-redirect-from
+url: https://github.com/googleapis/aip
+defaults:
+  - scope:
+      path: aip
+    values:
+      js:
+        - /assets/js/proto-syntax.js
+  - scope:
+      path: README.md
+    values:
+      exclude_from_search: true
+tipue_search:
+  include:
+    pages: true

_includes/aip-breadcrumb.html

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+<nav class="h-c-breadcrumbs h-u-mt-std" aria-label="You are here.">
+  <ol class="h-c-breadcrumbs__list">
+    <li class="h-c-breadcrumbs__item" aria-level="1">
+      <a class="h-c-breadcrumbs__link" href="/">API Improvement Proposals</a>
+    </li>
+    {% if page.aip %}
+    <li class="h-c-breadcrumbs__item" aria-level="2">
+      <a
+        class="h-c-breadcrumbs__link"
+        href="/{{ page.aip.scope | default: '#aip-listing' }}"
+      >
+        {{ page.aip.scope | default: 'general' | capitalize }} AIPs
+      </a>
+    </li>
+    {% endif %}
+    <li
+      class="h-c-breadcrumbs__item h-c-breadcrumbs__item--active"
+      aria-level="3"
+    >
+      {{ page.title }}
+    </li>
+  </ol>
+</nav>

_includes/aip-nav.html

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+{% assign areas = 'apps,cloud' | split: ',' %}
+{% assign scope = page.aip.scope or page.aip_index.scope %}
+<nav id="aip-nav" class="docs-component-nav">
+  <ul class="nav-list">
+    <li class="nav-item nav-item-header">API Improvement Proposals</li>
+    <li class="nav-item{% if page.url == '/' %} nav-item-active{% endif %}">
+      <a href="/">General</a>
+    </li>
+    {% for area in areas %}
+    {% if page.aip_index.scope == area %}
+      {% assign scope = area %}
+    {% endif %}
+    <li class="nav-item{% if page.aip_index.scope == area %} nav-item-active{% endif %}">
+      <a href="/{{ area }}">{{ area | capitalize }}</a>
+    </li>
+    {% endfor %}
+    <li class="nav-item nav-item-header">Tools</li>
+    <li class="nav-item">
+      <a href="https://github.com/googleapis/api-linter" target="_blank">API Linter</a>
+      <svg role="img" class="h-c-icon h-c-icon--arrow-external" style="width: 14px; height: 14px; margin-bottom: -2px;">
+        <use xlink:href="#mi-arrow-forward"></use>
+      </svg>
+    </li>
+    <li class="nav-item">
+      <a href="https://cloud.google.com/apis/design/" target="_blank">Cloud API Design Guide</a>
+      <svg role="img" class="h-c-icon h-c-icon--arrow-external" style="width: 14px; height: 14px; margin-bottom: -2px;">
+          <use xlink:href="#mi-arrow-forward"></use>
+      </svg>
+    </li>
+    <li class="nav-item nav-item-header">
+      {{ scope | default: 'general' | capitalize }} AIPs
+    </li>
+    {% for p in site.pages %}{% if p.aip and p.aip.scope == scope -%}
+    <li class="nav-item{% if p.url == page.url %} nav-item-active{% endif %}">
+      <a href="{{ p.url }}">
+        <span class="aip-number">{{ p.aip.id }}</span> {{ p.title }}
+      </a>
+    </li>
+    {% endif %}{% endfor -%}
+  </ul>
+</nav>