Add jekyll-tidy plugin for tidy HTML output

Gemfile

@@ -13,6 +13,7 @@ group :jekyll_plugins do
   gem 'jekyll-pants'
   gem 'jekyll-seo-tag'
   gem 'jekyll-sitemap'
+  gem 'jekyll-tidy'
   gem 'uglifier' # required by 'jekyll-assets' for JS compression
 end
 

Gemfile.lock

@@ -12,6 +12,8 @@ GEM
     fastimage (2.1.0)
     ffi (1.9.18)
     forwardable-extended (2.6.0)
+    htmlbeautifier (1.3.1)
+    htmlcompressor (0.3.1)
     jekyll (3.5.0)
       addressable (~> 2.4)
       colorator (~> 1.0)
@@ -39,6 +41,10 @@ GEM
       jekyll (~> 3.3)
     jekyll-sitemap (1.0.0)
       jekyll (~> 3.3)
+    jekyll-tidy (0.2.2)
+      htmlbeautifier
+      htmlcompressor
+      jekyll
     jekyll-watch (1.5.0)
       listen (~> 3.0, < 3.1)
     kramdown (1.14.0)
@@ -86,6 +92,7 @@ DEPENDENCIES
   jekyll-pants
   jekyll-seo-tag
   jekyll-sitemap
+  jekyll-tidy
   rake
   rubocop
   tzinfo-data

_config.yml

@@ -36,6 +36,7 @@ plugins:
   - jekyll-pants
   - jekyll-sitemap
   - jekyll-seo-tag
+  - jekyll-tidy
 
 defaults:
   -