Adding multiple RSS feeds

I finally have multiple RSS feeds on my site! I previously used Eleventy to auto-generate the feed, but that method only works to make a single feed, and I wanted to have a separate one for my new notes feed.

I ended up having to make an explicit template for how the feeds should look, and then I can apply that template to each feed that I need to generate. I'd been wanting to do this for a while, but had seriously struggled. Eventually this writeup helped me figure it out, and I borrowed from how Benji imported a template to avoid repeating the same code for each feed. I'm very happy to have this working!