created 'static pages' controller

first controller created, and new files generated
Finishing up static pages

finished adding some actions to 'static_pages_controller', and created 'about' pages by using
'minitest' to write some tests. Also refactored some some info from the 'about' and 'home' views/layout into
the 'application' views/layout. Also set up 'static_pages#home' as my root route.