added the bootstrap scaffolding page

just want to play around with this to try and break things and see why
the sidenav keeps breaking on my main index page
added custom css to testModify

switching to local css files and adding a custom css file doesn't break
the sidenav
removed affix-top from testModify

removing affix-top doesn't remove affix behavior for sidenav
removed classes from section elements

also changed location of comment end so it didn't comment out </body>