Remove legacy status lists.

These lists date to the beginning of the project and were an early
attempt to track authorship of resources. However, they haven't been
maintained and are long out of date; it's been several years now since
they were even last edited. In the worst case this makes them actively
misleading.

Resources are still divided up into directories by author, which is
much more likely to be accurate at this point (although not perfect
for assigning credit either).