Remove nokogiri dependency

Gemfile

@@ -1,13 +1,10 @@
 source 'https://rubygems.org'
 
-gem 'jekyll', '3.8.4'
+gem 'jekyll'
 
 group :jekyll_plugins do
-  gem 'jekyll-archives', '2.1.1'
-  gem 'jekyll-extract-element', '0.0.7'
-  gem 'jekyll-feed', '0.9.3'
-  gem 'jekyll-seo-tag', '2.4.0'
-  gem 'jekyll-sitemap', '1.2.0'
+  gem 'jekyll-archives'
+  gem 'jekyll-feed'
+  gem 'jekyll-seo-tag'
+  gem 'jekyll-sitemap'
 end
-
-gem "yajl-ruby", '~> 1.3.1'

Gemfile.lock

@@ -1,20 +1,20 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.2)
+    addressable (2.6.0)
       public_suffix (>= 2.0.2, < 4.0)
     colorator (1.1.0)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.4)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
     eventmachine (1.2.7)
-    ffi (1.9.25)
+    ffi (1.10.0)
     forwardable-extended (2.6.0)
     http_parser.rb (0.6.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (3.8.4)
+    jekyll (3.8.5)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
@@ -29,18 +29,15 @@ GEM
       safe_yaml (~> 1.0)
     jekyll-archives (2.1.1)
       jekyll (>= 2.4)
-    jekyll-extract-element (0.0.7)
-      jekyll (~> 3.3)
-      nokogiri (= 1.8.2)
-    jekyll-feed (0.9.3)
+    jekyll-feed (0.11.0)
       jekyll (~> 3.3)
     jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
-    jekyll-seo-tag (2.4.0)
+    jekyll-seo-tag (2.5.0)
       jekyll (~> 3.3)
     jekyll-sitemap (1.2.0)
       jekyll (~> 3.3)
-    jekyll-watch (2.1.1)
+    jekyll-watch (2.1.2)
       listen (~> 3.0)
     kramdown (1.17.0)
     liquid (4.0.1)
@@ -49,36 +46,30 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
     mercenary (0.3.6)
-    mini_portile2 (2.3.0)
-    nokogiri (1.8.2)
-      mini_portile2 (~> 2.3.0)
-    pathutil (0.16.1)
+    pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (3.0.3)
     rb-fsevent (0.10.3)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
     rouge (3.3.0)
     ruby_dep (1.5.0)
     safe_yaml (1.0.4)
-    sass (3.6.0)
+    sass (3.7.3)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    yajl-ruby (1.3.1)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  jekyll (= 3.8.4)
-  jekyll-archives (= 2.1.1)
-  jekyll-extract-element (= 0.0.7)
-  jekyll-feed (= 0.9.3)
-  jekyll-seo-tag (= 2.4.0)
-  jekyll-sitemap (= 1.2.0)
-  yajl-ruby (~> 1.3.1)
+  jekyll
+  jekyll-archives
+  jekyll-feed
+  jekyll-seo-tag
+  jekyll-sitemap
 
 BUNDLED WITH
-   1.16.4
+   1.17.2

_config.yml

@@ -24,7 +24,6 @@ timezone: CEST
 permalink: /:categories/:title/
 
 plugins:
-  - jekyll-extract-element
   - jekyll-sitemap
   - jekyll-seo-tag
   - jekyll-feed