templates/about: Improved layout and added more information
templates/about: Added banner image
templates/about: Modified welcome text
templates/about: Use id="about" instead of "getting_started"
templates/about: Added social buttons
templates/about: Added links to tracking and database headers
templates/about: Added icons to external links
views: Let / route serve the about page
Merge pull request #87 from Turbo87/about

Improved "About" page