Partners: fetch from DB instead

This pull makes it so that all data related to gold partners is loaded out of the database, so that partners can be added and removed and changes can be made to logos/text/etc. without requiring any code changes.

Deploying this will involve creating the new database table, filling with all the current partner info, and uploading all logos to S3 (and adding the urls for those logos to the table).

@bsimpson63 @chromakode