Removed unnecessary Gem dependencies

Signed-off-by: Jim Martens <github@2martens.de>

Gemfile

@@ -4,10 +4,8 @@ gem 'activesupport'
 gem 'mini_racer'
 # gem 'github-pages-health-check'
 gem 'html-proofer', group: :development
-gem 'jekyll', '~> 3.8.4'
+gem 'jekyll', '~> 3.8.5'
 group :jekyll_plugins do
-  gem 'autoprefixer-rails'
-  gem 'bootstrap', '~> 4.3.1'
   gem 'jekyll-avatar'
   gem 'jekyll-coffeescript'
   gem 'jekyll-commonmark-ghpages'
@@ -26,10 +24,7 @@ group :jekyll_plugins do
   gem 'jekyll-sitemap'
   gem 'jekyll-titles-from-headings'
   gem 'jemoji'
-  gem 'sprockets', '~> 4.0.0beta8'
-  gem 'uglifier'
 end
-gem 'jekyll-sass-converter', '~> 1.5.2'
 # themes
 gem 'jekyll-swiss'
 gem 'jekyll-theme-architect'
@@ -55,6 +50,5 @@ gem 'rack', '~> 2.0.6'
 gem 'rouge'
 gem 'rubocop'
 gem 'rubyzip', '~> 1.2.2'
-gem 'sass_paths'
 # gem 'ruby-oembed'
 gem 'terminal-table'