Add jekyll-minifier (#668)

* Remove obsolete plugins

* Add `jekyll-minifier`

* Add `JEKYLL_ENV=production`

Author: rohandebsarkar

Gemfile

@@ -5,18 +5,17 @@ group :jekyll_plugins do
     gem 'jekyll-diagrams'
     gem 'jekyll-email-protect'
     gem 'jekyll-feed'
-    gem 'jekyll-github-metadata'
     gem 'jekyll-imagemagick'
+    gem 'jekyll-minifier'
     gem 'jekyll-paginate-v2'
     gem 'jekyll-scholar'
     gem 'jekyll-sitemap'
     gem 'jekyll-target-blank'
     gem 'jekyll-twitter-plugin'
     gem 'jemoji'
+    gem 'mini_racer'
     gem 'unicode_utils'
     gem 'webrick'
-    gem 'htmlcompressor'
-    gem 'htmlbeautifier'
 end
 group :other_plugins do
     gem 'httparty'

_config.yml

@@ -156,8 +156,8 @@ plugins:
   - jekyll-diagrams
   - jekyll-email-protect
   - jekyll-feed
-  - jekyll-github-metadata
   - jekyll-imagemagick
+  - jekyll-minifier
   - jekyll-paginate-v2
   - jekyll/scholar
   - jekyll-sitemap
@@ -171,27 +171,15 @@ defaults:
       path: "assets/**/*.*"
     values:
       sitemap: false
-# Extras
-github: [metadata]
 
 # -----------------------------------------------------------------------------
-# Jekyll optimization
+# Jekyll Minifier
 # -----------------------------------------------------------------------------
 
-# HTML remove comments (<!-- .... -->)
-remove_HTML_comments: false
-
-# HTML beautifier (_plugins/beautify.rb).
-# Source: https://github.com/threedaymonk/htmlbeautifier
-beautify: false # This function has conflict with the code snippets, they can be displayed incorrectly
-
-# HTML minify (_plugins/minify.rb).
-# Source: https://www.ffbit.com/blog/2021/03/17/html-minification-in-jekyll.html
-minify: false
-
-# CSS/SASS minify
-sass:
-  style: compressed
+jekyll-minifier:
+  exclude: ['robots.txt']
+  uglifier_args:
+    harmony: true
 
 # -----------------------------------------------------------------------------
 # Jekyll Archives

_plugins/beautify.rb

@@ -91,6 +91,9 @@ then
 fi
 git checkout -b $DEPLOY_BRANCH
 
+# Export JEKYLL_ENV=production
+export JEKYLL_ENV=production
+
 # Build site
 bundle exec jekyll build