Copy in real, latest bootstrap-fedora.

I thought I did this in 5120bf05dadf8efeb7951e00b71cd55986bcee60, but
apparently I copied the wrong thing.  This fixes it and makes fmn's UI look
much more like bodhi2.
Constrain the navbar in a container.
Navbar tweaks to make fmn match up with bodhi2.
Merge pull request #25 from fedora-infra/feature/bodhi-ui-matchup

Make fmn look more like bodhi2.