Update AdminLTE

- from 2.4.5 to 2.4.18 (cannot detect any issues)
- set default scancycle for Apple Devices to 1

front/lib/AdminLTE/bower_components/bootstrap/Gemfile

@@ -1,6 +1,8 @@
 source 'https://rubygems.org'
 
 group :development, :test do
-  gem 'jekyll', '~> 3.1.2'
-  gem 'jekyll-sitemap', '~> 0.11.0'
+  gem 'jekyll', '~> 3.8.5'
+  gem 'jekyll-redirect-from', '~> 0.14.0'
+  gem 'jekyll-sitemap', '~> 1.2.0'
+  gem 'wdm', '~> 0.1.1', :install_if => Gem.win_platform?
 end