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
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; fixed > in breadcrumb