feat: rss feed support

bluesky's first-party client has a feature i don't see many talk about: RSS feeds of basically any account. i use the feedbro extension for firefox to get these RSS feeds, and it's been nice to have, even if push notifications already serve the same purpose now of delivering posts to a user. however, RSS feeds on bsky's client are not fully fleshed out, as images and videos aren't attached to posts in the RSS feeds. i wonder if similar, if not better, RSS support could be implemented into witchsky