The PieFed API now includes Feeds and Topics endpoints

• https://piefed.social/api/alpha/topic/list
• https://piefed.social/api/alpha/feed/list - This one has two boolean parameters: mine_only (only return feeds the current user created) and exclude_communities (reduce result size)

Also /api/alpha/post/list now has a topic_id and a feed_id parameter, to get posts in those topics and feeds.

No PUT, POST, etc endpoints yet, only GET.