Enable Brotli compression

- Compress file AOD.
- Let the server only use static files. 
- Don't add github-pages to jekyll-plugins group, due to the fact github-pages will behave differently when enabling production ENV.
- Adds an extra 10s for the `host` to use `./buid.sh` due to compressing all files.
- Resolves #2186

Gemfile

@@ -1,12 +1,10 @@
 source "https://rubygems.org"
 
 # Install github-pages gem (https://jekyllrb.com/docs/github-pages/)
-gem "github-pages", group: :jekyll_plugins
+gem "github-pages"
 
-# Plugins
-group :jekyll_plugins do
-  # example: gem "jekyll-feed", "~> 0.6"
-end
+# Install jekyll-brotli gem (https://github.com/philnash/jekyll-brotli/)
+gem 'jekyll-brotli'
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem "tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby]

Gemfile.lock

@@ -9,6 +9,7 @@ GEM
       zeitwerk (~> 2.2, >= 2.2.2)
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
+    brotli (0.2.3)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
@@ -26,9 +27,11 @@ GEM
       ffi (>= 1.3.0)
     eventmachine (1.2.7)
     execjs (2.7.0)
-    faraday (1.2.0)
+    faraday (1.3.0)
+      faraday-net_http (~> 1.0)
       multipart-post (>= 1.2, < 3)
       ruby2_keywords
+    faraday-net_http (1.0.1)
     ffi (1.14.2)
     forwardable-extended (2.6.0)
     gemoji (3.0.1)
@@ -103,6 +106,9 @@ GEM
       safe_yaml (~> 1.0)
     jekyll-avatar (0.7.0)
       jekyll (>= 3.0, < 5.0)
+    jekyll-brotli (2.2.1)
+      brotli (~> 0.2.0)
+      jekyll (>= 3.0, < 5.0)
     jekyll-coffeescript (1.1.1)
       coffee-script (~> 2.2)
       coffee-script-source (~> 1.11.1)
@@ -203,21 +209,23 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.5.0)
     minima (2.5.1)
       jekyll (>= 3.5, < 5.0)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
-    minitest (5.14.2)
+    minitest (5.14.3)
     multipart-post (2.1.1)
-    nokogiri (1.10.10)
-      mini_portile2 (~> 2.4.0)
-    octokit (4.19.0)
+    nokogiri (1.11.1)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
+    octokit (4.20.0)
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (3.1.1)
+    racc (1.5.2)
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -256,6 +264,7 @@ PLATFORMS
 
 DEPENDENCIES
   github-pages
+  jekyll-brotli
   tzinfo-data
 
 BUNDLED WITH

_config.yml

@@ -6,7 +6,9 @@ production_url: "https://www.privacytools.io"
 sass:
   style: compressed
 plugins:
+  - github-pages
   - jekyll-sitemap
+  - jekyll-brotli
 sitemap:
 file: "/sitemap.xml"
 include: [".well-known"]

build.sh

@@ -1,4 +1,4 @@
 #!/usr/bin/env sh
 set -e # halt script on error
 
-bundle exec jekyll build
+JEKYLL_ENV=production bundle exec jekyll build