Add guide on applying Front Matter defaults to jekyll-archives pages

Sources:
- mmistakes#2465 (comment)
- iBug/iBug-source@8685c1e

.gitignore

@@ -10,7 +10,7 @@
 *.gem
 .bundle
 Gemfile.lock
-vendor/bundle
+**/vendor/bundle
 
 # Node.js and NPM
 node_modules

docs/_docs/05-configuration.md

@@ -1029,6 +1029,30 @@ jekyll-archives:
 **Note:** The `archive-taxonomy` layout used by jekyll-archives is provided with the theme and can be found in the `_layouts` folder.
 {: .notice--info}
 
+<div class="notice--success" markdown="1">
+
+<h4 class="no_toc"><i class="fas fa-lightbulb"></i> Tip</h4>
+
+To apply [Front Matter defaults](https://jekyllrb.com/docs/configuration/front-matter-defaults/) to pages generated by the `jekyll-archives` plugin, you can specify a scope of an empty `path` and a `type` of either `tag` or `category`.
+
+For example, the following configuration enables author profile on tag archives and disables comments on category archives.
+
+```yaml
+defaults:
+  - scope:
+      path: ""
+      type: tag
+    values:
+      author_profile: true
+  - scope:
+      path: ""
+      type: category
+    values:
+      comments: false
+```
+
+</div>
+
 ## HTML compression
 
 If you care at all about performance (and really who doesn't) compressing the HTML files generated by Jekyll is a good thing to do.