deps: Minimize dependencies to just jekyll and necessary plugins

The website is not hosted with github pages, there's no need to use all
of its dependencies as we do not use them either.

Author: achow101

Gemfile

@@ -8,7 +8,9 @@ ruby '2.7.4'
 
 ## If you add a new Gem below, run `bundle install` to install it.
 group :development do
-  gem 'github-pages'
+  gem 'jekyll'
+  gem 'jekyll-redirect-from'
+  gem 'kramdown-parser-gfm'
 end
 
 group :testing do

Gemfile.lock

@@ -1,106 +1,18 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (6.0.4.4)
-      concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (>= 0.7, < 2)
-      minitest (~> 5.1)
-      tzinfo (~> 1.1)
-      zeitwerk (~> 2.2, >= 2.2.2)
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
-    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 (1.1.9)
-    dnsruby (1.61.7)
-      simpleidn (~> 0.1)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
     ethon (0.15.0)
       ffi (>= 1.15.0)
     eventmachine (1.2.7)
-    execjs (2.8.1)
-    faraday (1.8.0)
-      faraday-em_http (~> 1.0)
-      faraday-em_synchrony (~> 1.0)
-      faraday-excon (~> 1.1)
-      faraday-httpclient (~> 1.0.1)
-      faraday-net_http (~> 1.0)
-      faraday-net_http_persistent (~> 1.1)
-      faraday-patron (~> 1.0)
-      faraday-rack (~> 1.0)
-      multipart-post (>= 1.2, < 3)
-      ruby2_keywords (>= 0.0.4)
-    faraday-em_http (1.0.0)
-    faraday-em_synchrony (1.0.0)
-    faraday-excon (1.1.0)
-    faraday-httpclient (1.0.1)
-    faraday-net_http (1.0.1)
-    faraday-net_http_persistent (1.2.0)
-    faraday-patron (1.0.0)
-    faraday-rack (1.0.0)
     ffi (1.15.4)
     forwardable-extended (2.6.0)
-    gemoji (3.0.1)
-    github-pages (222)
-      github-pages-health-check (= 1.17.9)
-      jekyll (= 3.9.0)
-      jekyll-avatar (= 0.7.0)
-      jekyll-coffeescript (= 1.1.1)
-      jekyll-commonmark-ghpages (= 0.1.6)
-      jekyll-default-layout (= 0.1.4)
-      jekyll-feed (= 0.15.1)
-      jekyll-gist (= 1.5.0)
-      jekyll-github-metadata (= 2.13.0)
-      jekyll-mentions (= 1.6.0)
-      jekyll-optional-front-matter (= 0.3.2)
-      jekyll-paginate (= 1.1.0)
-      jekyll-readme-index (= 0.3.0)
-      jekyll-redirect-from (= 0.16.0)
-      jekyll-relative-links (= 0.6.1)
-      jekyll-remote-theme (= 0.4.3)
-      jekyll-sass-converter (= 1.5.2)
-      jekyll-seo-tag (= 2.7.1)
-      jekyll-sitemap (= 1.4.0)
-      jekyll-swiss (= 1.0.0)
-      jekyll-theme-architect (= 0.2.0)
-      jekyll-theme-cayman (= 0.2.0)
-      jekyll-theme-dinky (= 0.2.0)
-      jekyll-theme-hacker (= 0.2.0)
-      jekyll-theme-leap-day (= 0.2.0)
-      jekyll-theme-merlot (= 0.2.0)
-      jekyll-theme-midnight (= 0.2.0)
-      jekyll-theme-minimal (= 0.2.0)
-      jekyll-theme-modernist (= 0.2.0)
-      jekyll-theme-primer (= 0.6.0)
-      jekyll-theme-slate (= 0.2.0)
-      jekyll-theme-tactile (= 0.2.0)
-      jekyll-theme-time-machine (= 0.2.0)
-      jekyll-titles-from-headings (= 0.5.3)
-      jemoji (= 0.12.0)
-      kramdown (= 2.3.1)
-      kramdown-parser-gfm (= 1.1.0)
-      liquid (= 4.0.3)
-      mercenary (~> 0.3)
-      minima (= 2.5.1)
-      nokogiri (>= 1.12.5, < 2.0)
-      rouge (= 3.26.0)
-      terminal-table (~> 1.4)
-    github-pages-health-check (1.17.9)
-      addressable (~> 2.3)
-      dnsruby (~> 1.60)
-      octokit (~> 4.0)
-      public_suffix (>= 3.0, < 5.0)
-      typhoeus (~> 1.3)
-    html-pipeline (2.14.0)
-      activesupport (>= 2)
-      nokogiri (>= 1.4)
     html-proofer (3.19.2)
       addressable (~> 2.3)
       mercenary (~> 0.3)
@@ -125,99 +37,12 @@ GEM
       pathutil (~> 0.9)
       rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
-    jekyll-avatar (0.7.0)
-      jekyll (>= 3.0, < 5.0)
-    jekyll-coffeescript (1.1.1)
-      coffee-script (~> 2.2)
-      coffee-script-source (~> 1.11.1)
-    jekyll-commonmark (1.3.1)
-      commonmarker (~> 0.14)
-      jekyll (>= 3.7, < 5.0)
-    jekyll-commonmark-ghpages (0.1.6)
-      commonmarker (~> 0.17.6)
-      jekyll-commonmark (~> 1.2)
-      rouge (>= 2.0, < 4.0)
-    jekyll-default-layout (0.1.4)
-      jekyll (~> 3.0)
-    jekyll-feed (0.15.1)
-      jekyll (>= 3.7, < 5.0)
-    jekyll-gist (1.5.0)
-      octokit (~> 4.2)
-    jekyll-github-metadata (2.13.0)
-      jekyll (>= 3.4, < 5.0)
-      octokit (~> 4.0, != 4.4.0)
-    jekyll-mentions (1.6.0)
-      html-pipeline (~> 2.3)
-      jekyll (>= 3.7, < 5.0)
-    jekyll-optional-front-matter (0.3.2)
-      jekyll (>= 3.0, < 5.0)
-    jekyll-paginate (1.1.0)
-    jekyll-readme-index (0.3.0)
-      jekyll (>= 3.0, < 5.0)
     jekyll-redirect-from (0.16.0)
       jekyll (>= 3.3, < 5.0)
-    jekyll-relative-links (0.6.1)
-      jekyll (>= 3.3, < 5.0)
-    jekyll-remote-theme (0.4.3)
-      addressable (~> 2.0)
-      jekyll (>= 3.5, < 5.0)
-      jekyll-sass-converter (>= 1.0, <= 3.0.0, != 2.0.0)
-      rubyzip (>= 1.3.0, < 3.0)
     jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
-    jekyll-seo-tag (2.7.1)
-      jekyll (>= 3.8, < 5.0)
-    jekyll-sitemap (1.4.0)
-      jekyll (>= 3.7, < 5.0)
-    jekyll-swiss (1.0.0)
-    jekyll-theme-architect (0.2.0)
-      jekyll (> 3.5, < 5.0)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-cayman (0.2.0)
-      jekyll (> 3.5, < 5.0)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-dinky (0.2.0)
-      jekyll (> 3.5, < 5.0)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-hacker (0.2.0)
-      jekyll (> 3.5, < 5.0)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-leap-day (0.2.0)
-      jekyll (> 3.5, < 5.0)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-merlot (0.2.0)
-      jekyll (> 3.5, < 5.0)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-midnight (0.2.0)
-      jekyll (> 3.5, < 5.0)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-minimal (0.2.0)
-      jekyll (> 3.5, < 5.0)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-modernist (0.2.0)
-      jekyll (> 3.5, < 5.0)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-primer (0.6.0)
-      jekyll (> 3.5, < 5.0)
-      jekyll-github-metadata (~> 2.9)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-slate (0.2.0)
-      jekyll (> 3.5, < 5.0)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-tactile (0.2.0)
-      jekyll (> 3.5, < 5.0)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-time-machine (0.2.0)
-      jekyll (> 3.5, < 5.0)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-titles-from-headings (0.5.3)
-      jekyll (>= 3.3, < 5.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    jemoji (0.12.0)
-      gemoji (~> 3.0)
-      html-pipeline (~> 2.2)
-      jekyll (>= 3.0, < 5.0)
     kramdown (2.3.1)
       rexml
     kramdown-parser-gfm (1.1.0)
@@ -228,20 +53,11 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
     mini_portile2 (2.6.1)
-    minima (2.5.1)
-      jekyll (>= 3.5, < 5.0)
-      jekyll-feed (~> 0.9)
-      jekyll-seo-tag (~> 2.1)
-    minitest (5.15.0)
-    multipart-post (2.1.1)
     nokogiri (1.12.5)
       mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
     nokogumbo (2.0.5)
       nokogiri (~> 1.8, >= 1.8.4)
-    octokit (4.21.0)
-      faraday (>= 0.9)
-      sawyer (~> 0.8.0, >= 0.5.3)
     parallel (1.21.0)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
@@ -253,44 +69,27 @@ GEM
       ffi (~> 1.0)
     rexml (3.2.5)
     rouge (3.26.0)
-    ruby-enum (0.9.0)
-      i18n
-    ruby2_keywords (0.0.5)
-    rubyzip (2.3.2)
     safe_yaml (1.0.5)
     sass (3.7.4)
       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 (0.8.2)
-      addressable (>= 2.3.5)
-      faraday (> 0.8, < 2.0)
-    simpleidn (0.2.1)
-      unf (~> 0.1.4)
-    terminal-table (1.8.0)
-      unicode-display_width (~> 1.1, >= 1.1.1)
-    thread_safe (0.3.6)
     typhoeus (1.4.0)
       ethon (>= 0.9.0)
-    tzinfo (1.2.9)
-      thread_safe (~> 0.1)
-    unf (0.1.4)
-      unf_ext
-    unf_ext (0.0.8)
-    unicode-display_width (1.8.0)
     yell (2.2.2)
-    zeitwerk (2.5.1)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  github-pages
   html-proofer
+  jekyll
+  jekyll-redirect-from
+  kramdown-parser-gfm
 
 RUBY VERSION
    ruby 2.7.4p191
 
 BUNDLED WITH
-   2.2.33
+   2.4.12