Idea: ability to have multiple separate feeds

[larryhudson]

At the moment, all the articles (whether they're text to speech articles or things downloaded with yt-dlp) go into a single feed which is served from /rss.xml. We can change this so that we can have multiple feeds.

What we would need to do:

• create a new database table called 'feeds'. Columns should include title, slug. When initialising the database, if there are no feeds, create a default one.
• Maybe there's an option to set a feed as your 'default' feed?
• Change src/pages/rss.xml.js into src/pages/feeds/[slug].xml.js
• When adding a new article, you would have an option of choosing which feed you want to add it to. If you don't choose, it goes into your 'default' feed?
• Maybe certain domains can go into certain feeds automatically

[larryhudson]

I've started working on this in the multiple-feeds branch.