Update database.rst

i kept trying to import the .gz mbox files, and i was going crazy, then on a whim i tried the .txt ones and that worked!
Redesign of the list overview page, including extensive modification of the graph and a lot of CSS tweaks (no extra breadcrumb)
forgot to commit a filter needed for the list overview changes
converting header from overview from h2 to h1 for more consistency across pages
adjusted category badges on list overview
modified the left pane in the list overview page to provide more space and line wrapping for long user names