I'm moving to self-hosting this site and building it from my self-hosted
code repo and CI, which won't have access to my FreeTube subscriptions
when it builds. To get around this, I've moved to a script that will
snapshot my local FreeTube subscriptions to a JSON file. I'll commit this
file, and it can be used in the build on CI.
I thought the channel names were already sorted in the source data file,
but it turns out they aren't. I now sort them after sorting the category
names.