Revert "Update ruby version and dependencies"

This reverts commit abe8e09.

.ruby-version

@@ -1 +1 @@
-3.3.1
+2.7.4

Gemfile

@@ -7,7 +7,7 @@ source "https://rubygems.org"
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
-gem 'jekyll', '~> 4.3', '>= 4.3.3'
+gem "jekyll", "~> 3.9.0"
 gem "just-the-docs"
 gem "kramdown-parser-gfm", "~> 1.1"
 
@@ -16,7 +16,7 @@ gem "kramdown-parser-gfm", "~> 1.1"
 # gem "github-pages", group: :jekyll_plugins
 # If you have any plugins, put them here!
 group :jekyll_plugins do
-  gem "jekyll-feed"
+  gem "jekyll-feed", "~> 0.12"
 end
 
 # Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem

Gemfile.lock

@@ -1,94 +1,81 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.6)
-      public_suffix (>= 2.0.2, < 6.0)
-    bigdecimal (3.1.8)
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
-    concurrent-ruby (1.3.1)
-    em-websocket (0.5.3)
+    concurrent-ruby (1.1.9)
+    em-websocket (0.5.2)
       eventmachine (>= 0.12.9)
-      http_parser.rb (~> 0)
+      http_parser.rb (~> 0.6.0)
     eventmachine (1.2.7)
-    ffi (1.17.0-x86_64-linux-gnu)
+    ffi (1.15.3)
     forwardable-extended (2.6.0)
-    google-protobuf (4.27.0-x86_64-linux)
-      bigdecimal
-      rake (>= 13)
-    http_parser.rb (0.8.0)
-    i18n (1.14.5)
+    http_parser.rb (0.6.0)
+    i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (4.3.3)
+    jekyll (3.9.1)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
-      i18n (~> 1.0)
-      jekyll-sass-converter (>= 2.0, < 4.0)
+      i18n (~> 0.7)
+      jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 2.0)
-      kramdown (~> 2.3, >= 2.3.1)
-      kramdown-parser-gfm (~> 1.0)
+      kramdown (>= 1.17, < 3)
       liquid (~> 4.0)
-      mercenary (>= 0.3.6, < 0.5)
+      mercenary (~> 0.3.3)
       pathutil (~> 0.9)
-      rouge (>= 3.0, < 5.0)
+      rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
-      terminal-table (>= 1.8, < 4.0)
-      webrick (~> 1.7)
-    jekyll-feed (0.17.0)
+    jekyll-feed (0.15.1)
       jekyll (>= 3.7, < 5.0)
-    jekyll-include-cache (0.2.1)
-      jekyll (>= 3.7, < 5.0)
-    jekyll-sass-converter (3.0.0)
-      sass-embedded (~> 1.54)
-    jekyll-seo-tag (2.8.0)
+    jekyll-sass-converter (1.5.2)
+      sass (~> 3.4)
+    jekyll-seo-tag (2.7.1)
       jekyll (>= 3.8, < 5.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    just-the-docs (0.8.2)
+    just-the-docs (0.3.3)
       jekyll (>= 3.8.5)
-      jekyll-include-cache
-      jekyll-seo-tag (>= 2.0)
-      rake (>= 12.3.1)
-    kramdown (2.4.0)
+      jekyll-seo-tag (~> 2.0)
+      rake (>= 12.3.1, < 13.1.0)
+    kramdown (2.3.1)
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
-    liquid (4.0.4)
-    listen (3.9.0)
+    liquid (4.0.3)
+    listen (3.7.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
-    mercenary (0.4.0)
+    mercenary (0.3.6)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (5.0.5)
-    rake (13.2.1)
-    rb-fsevent (0.11.2)
-    rb-inotify (0.11.1)
+    public_suffix (4.0.6)
+    rake (13.0.6)
+    rb-fsevent (0.11.0)
+    rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rexml (3.2.8)
-      strscan (>= 3.0.9)
-    rouge (4.2.1)
+    rexml (3.2.5)
+    rouge (3.26.0)
     safe_yaml (1.0.5)
-    sass-embedded (1.77.4-x86_64-linux-gnu)
-      google-protobuf (>= 3.25, < 5.0)
-    strscan (3.1.0)
-    terminal-table (3.0.2)
-      unicode-display_width (>= 1.1.1, < 3)
+    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)
     thread_safe (0.3.6)
     tzinfo (1.2.9)
       thread_safe (~> 0.1)
     tzinfo-data (1.2021.1)
       tzinfo (>= 1.0.0)
-    unicode-display_width (2.5.0)
     wdm (0.1.1)
-    webrick (1.8.1)
 
 PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
-  jekyll (~> 4.3, >= 4.3.3)
-  jekyll-feed
+  jekyll (~> 3.9.0)
+  jekyll-feed (~> 0.12)
   just-the-docs
   kramdown-parser-gfm (~> 1.1)
   tzinfo (~> 1.2)