remove 2 unused files that were causing compass issues

because these 2 files don't have a '_' in front of
their filenames, compass was trying to compile them
as their own stylesheets.  We don't use bootstrap
that way, it gets included into another main stylesheet
by boostrap_parts.  so their existence was just causing
us to do more work every time we css:generate as well
as creating errors.

test plan:
nothing should change

Change-Id: Ia93ba9dd9382dabe7a2a33312f574462b45d642e
Reviewed-on: https://gerrit.instructure.com/37374
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Ryan Shaw <ryan@instructure.com>
QA-Review: Ryan Shaw <ryan@instructure.com>
Reviewed-by: Colleen Palmer <colleen@instructure.com>