Reorganize paperspec commands and pin dependency versions (#2)

Reviewed-on: #2

deploy/Caddyfile

@@ -1,4 +1,4 @@
-# Serves the paperspec website built by `python3 tools/site.py` (the `_site/` folder), copied to /srv/www/paperspec.
+# Serves the paperspec website built by `paperspec site` (`pixi run site`, the `_site/` folder), copied to /srv/www/paperspec.
 # The site mirrors the repository, so every schema is served at its $id and the JSON-LD context at the address
 # layers name; this file sets the media types those addresses need and lets any page fetch them.
 paperspec.scient.ing {