Hitherto the supporters list has been committed directly to the static
sponsors/index.html file. This was never ideal and a quick hack to
build Conservancy's supporters list at the beginning of the supporters
program.
With this change, a Django app now exists that dynamically generates the
supporters list.
The database rows must be built from Conservancy's internal Ledger file,
which will be done in a separate script.
462cbc3963