revert to stable jekyll, don't bother with html validation

.drone.yml

@@ -5,4 +5,3 @@ pipeline:
       - gem install bundler
       - bundle install --jobs=4
       - bundle exec jekyll build
-      - bundle exec htmlproofer ./_site --disable-external

.gitignore

@@ -5,3 +5,4 @@ _subrecipes
 .jekyll-cache
 .jekyll-metadata
 vendor
+.bundle/

Gemfile

@@ -7,10 +7,7 @@ source "https://rubygems.org"
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
-# gem "jekyll", "~> 4.0.0"
+gem "jekyll", "~> 4.0.0"
-gem "nokogiri", ">= 1.11.0.rc1"
-gem "jekyll", github: "jekyll/jekyll"
-gem "html-proofer"
 # This is the default theme for new Jekyll sites. You may change this to anything you like.
 # gem "minima", "~> 2.5"
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and

Gemfile.lock

@@ -1,23 +1,3 @@
-GIT
-  remote: https://github.com/jekyll/jekyll.git
-  revision: ab6ef0b257e4c7aafec0518d93bea3e9c4b75b75
-  specs:
-    jekyll (4.0.0)
-      addressable (~> 2.4)
-      colorator (~> 1.0)
-      em-websocket (~> 0.5)
-      i18n (>= 0.9.5, < 2)
-      jekyll-sass-converter (~> 2.0)
-      jekyll-watch (~> 2.0)
-      kramdown (~> 2.1)
-      kramdown-parser-gfm (~> 1.0)
-      liquid (~> 4.0)
-      mercenary (~> 0.4.0)
-      pathutil (~> 0.9)
-      rouge (~> 3.0)
-      safe_yaml (~> 1.0)
-      terminal-table (~> 1.8)
-
 GEM
   remote: https://rubygems.org/
   specs:
@@ -28,22 +8,27 @@ GEM
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
-    ethon (0.12.0)
-      ffi (>= 1.3.0)
     eventmachine (1.2.7)
     ffi (1.12.2)
     forwardable-extended (2.6.0)
-    html-proofer (3.15.1)
-      addressable (~> 2.3)
-      mercenary (~> 0.3)
-      nokogumbo (~> 2.0)
-      parallel (~> 1.3)
-      rainbow (~> 3.0)
-      typhoeus (~> 1.3)
-      yell (~> 2.0)
     http_parser.rb (0.6.0)
     i18n (1.8.2)
       concurrent-ruby (~> 1.0)
+    jekyll (4.0.0)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
+      em-websocket (~> 0.5)
+      i18n (>= 0.9.5, < 2)
+      jekyll-sass-converter (~> 2.0)
+      jekyll-watch (~> 2.0)
+      kramdown (~> 2.1)
+      kramdown-parser-gfm (~> 1.0)
+      liquid (~> 4.0)
+      mercenary (~> 0.3.3)
+      pathutil (~> 0.9)
+      rouge (~> 3.0)
+      safe_yaml (~> 1.0)
+      terminal-table (~> 1.8)
     jekyll-sass-converter (2.1.0)
       sassc (> 2.0.1, < 3.0)
     jekyll-watch (2.2.1)
@@ -55,17 +40,10 @@ GEM
     listen (3.2.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
-    mercenary (0.4.0)
+    mercenary (0.3.6)
-    mini_portile2 (2.4.0)
-    nokogiri (1.11.0.rc1)
-      mini_portile2 (~> 2.4.0)
-    nokogumbo (2.0.2)
-      nokogiri (~> 1.8, >= 1.8.4)
-    parallel (1.19.1)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.3)
-    rainbow (3.0.0)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -76,23 +54,18 @@ GEM
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     thread_safe (0.3.6)
-    typhoeus (1.3.1)
-      ethon (>= 0.9.0)
     tzinfo (1.2.6)
       thread_safe (~> 0.1)
     tzinfo-data (1.2019.3)
       tzinfo (>= 1.0.0)
     unicode-display_width (1.6.1)
     wdm (0.1.1)
-    yell (2.2.2)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  html-proofer
+  jekyll (~> 4.0.0)
-  jekyll!
-  nokogiri (>= 1.11.0.rc1)
   tzinfo (~> 1.2)
   tzinfo-data
   wdm (~> 0.1.1)