[Beta2] JavaScripten

Major

• Added redirect layout
• /docs/latest/ now redirects to the latest docs

Minor

• Tweaked responsive breakpoints (again) after real world testing
• Added margin above social media icons to prevent accidental tapping
• Added gem files so that bundle install and bundle exec jekyll serve work
• Disabled HTML minification when running via jekyll serve

Fixes

• Fixed <sup> line-height (again)
• Always show scrollbar to prevent layout "jumps"
• gem-based theme works with jekyll new again
• gem-based theme: google fonts now load correctly when JS is disabled