Add the mailchimp form

* Create a documentation folder
Relocates splash page header out of the page content
Wraps footer content in HTML tags, places social media contact info into unordered list and adds data fields for styling
Adds HTML tags around content and merges Mail Chimp signup from separate branch
Adds mail icon to project. This needs to be converted to a theme-friendly color!
Numerous style updates for splash page
Removes splash.scss file from layout directory and moves it into templates