Show page title on snapshot page

A page's <title> could be an important piece of information when
reviewing a snapshot. Since we're already capturing it, we might as
well show it on the snapshot page.
Show page title as tooltip for snapshot cards

This helps when looking through a sweep as you can hover cards to better
see what page they are a snapshot of.
Remove top border on vertical tables

We use tables to display status about snapshots and projects on their
respective `#show` pages. They were inheriting a top border from the
default Bootstrap styling. I introduced a class called `.table-vertical`
that you can apply to a `.table` to get rid of the top border.