Remove social javacript widgets

- Push all script loading to bottom of page for speed
- Move all scripts into their own include
- Move all CSS into their own include
- Update Google Analytics script to Universal
- Remove twitter widgets for buttons
- Include Font Awesome for social buttons
- Include social-buttons.css for social buttons
- Move all sidebars common code into sidebar-common.html
- Move published data on blog posts from sidebar to
  bottom of post.