Change URL for news items?

Right now, our URLs for news items include the "categories" (which we're actually treating as unordered tags). Example, a URL with categories lomap and release gives:

https://openfree.energy/lomap/release/2022/03/15/lomap-conda-forge/

Since we don't have a defined ordering on these, this could just as easily have been release/lomap/2022/03/15/lomap-conda-forge/. I think we should change this. Two ways to change (both about equally easy):

1. Distinguish between actual categories and tags. Each post must have 1 category. Possible categories include:

   • releases
   • hirings
   • presentations
   • science
   • misc

   We aren't locked into any set; we can always add more categories later as needed. This could be nice from a URL standpoint because we could have openfree.energy/releases/ as an index with all releases, and then within it openfree.energy/releases/2022/03/15/lomap-conda-forge/ .

2. Completely remove these labels from the URL. In this case, I'd probably want to add news/ as a level, and the URL would be openfree.energy/news/2022/03/15/lomap-conda-forge/

Either solution should be easy to implement (probably took me longer to write this issue).

Note that changing the URLs will break any existing links to them... but I highly doubt we have many incoming links to our 2 little news items.

The payload names no files, tests, or entry points, so first locate the site's news-item URL generation and inspect the existing news links. Resolve whether to distinguish categories from tags or remove labels in favor of a news/ path, then verify that the existing news items use the selected URL structure.