.NET Fringe 2017 Web Site - The Beginnings

Making this a separate PR in place of @Aaronontheweb's #145 as it has more information and some additional changes.

Preview

[ ] Still need actual links for the CFP & Tickets. Right now both point to todo.com.
[x] The _config.yml file needs to have the URL updated so that it no longer points to localhost and points instead to the actual site's URL.
[x] Prior to accepting the PR, we might want to make sure that GH Pages doesn't expect the entire site to live in the docs folder, per this Github link. I think we should be fine, but want someone to give it a second look with less tired eyes.
[x] Stop using site.url and ensure everything works relatively (thanks, @Aaronontheweb!)

A decision to pick a complimentary color to the blue (a mint green in this case)
The docs pages have also been re-styled (not linked to yet because their content is older)
The styles are now done using .scss
Structure site pieces are broken up into Jekyll includes (nav, footer, etc.)
Docs styles have been updated too -- it's all the same system now
Some older stylings (e.g. clearfix) have been removed
A readme was added to explain how to build the site
Different Jekyll configurations have been added for dev so that the site could be merged pointing to the correct URLs

We're still eyeing some other issues & enhancements as well, but those can be addressed outside the scope of this PR.