Create community page and basic layout

* Add responsiveness, text styling, first pass layout
* Scope border-bottom on h1's to .main class
* Clean up references to global nav partial
* replace border bottoms with HRs, WIP
* Refactor class naming system
* Style hr tags
* Separate styling for community preview on landing page from community page
* Update responsive styling for forum section of community page
* Style logo section
* Add logo section as a partial
* Change `container` class to `wrap-container`
* Add logo partial to landing page, create button mixins

https://trello.com/c/lgtX08mv
Add new favicon for v4 Middleman

https://trello.com/c/UN6YcgpO
Add links to navigation through pages

* Add links to docs
* Add links to external `middleman-directory` project
Add better Middleman logo SVG

* Replace SVG
* Set size limit for SVG
Connect sites using Middleman page to rest of website

* Add styles to site built but need to fix sticky
* Modify sticky sidebar by using fixed widths
* Rename `waypoints` tag class to `aside.sidebar-container`
* Refactor `#toc` into separate `sidebar` file
* Layout is *not responsive*
* Use new syntax for symbols
Fix syntax in config with hash rocket

* Use correct syntax
Replace second introduction item with illustration
Make some pages responsive (global nav, docs layout)

* Fix browser width of landing intro section
* Optimize layout for docs in different media sizes
* Make responsive global nav

https://trello.com/c/yPplScUQ
Add speech bubble icon to main section of community page
Minor performance prefs