feat: rename to paperspec and add the website

- Rename manuspec to paperspec everywhere outside pixi.toml: prose, the
  tools, provenance tool names and the fixture key derivations, so every
  fixture and vector is rebuilt.
- Move the namespace addresses under the site, mirroring the repository:
  schema $id https://paperspec.scient.ing/schemas/<file>, the JSON-LD
  context https://paperspec.scient.ing/context/scienting-1.jsonld, and
  term IRIs https://paperspec.scient.ing/vocab#<term>. Format
  identifiers (scienting-*) and URNs (urn:scienting:) are unchanged.
- tools/site.py (standard library only) builds _site/: every file of the
  repository at its own path, each Markdown file rendered as a page with
  sidebar navigation, heading anchors matching the forge's, folder
  listings, a vocabulary page for the context's IRIs, a heading search
  and a 404 page; light and dark themes.
- check.py builds the site and checks that every Markdown file has a
  page, every internal link and fragment resolves, no Markdown is left
  unrendered, and every $id, the context address and the vocabulary IRIs
  are files of the site.
- deploy/: a Caddyfile with the media types and CORS the data needs, and
  a guide; .gitea/workflows/site.yml builds on main and publishes with
  rsync when the SITE_* secrets are set.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/oracle/__init__.py

@@ -4,10 +4,10 @@ import importlib.util
 import sys
 
 if sys.version_info < (3, 14):
-    sys.exit("The manuspec tools need Python 3.14 or later; this is Python %d.%d." % sys.version_info[:2])
+    sys.exit("The paperspec tools need Python 3.14 or later; this is Python %d.%d." % sys.version_info[:2])
 
 _missing = [m for m in ("cryptography", "jsonschema") if importlib.util.find_spec(m) is None]
 if _missing:
-    sys.exit("The manuspec tools need %s %s; run them through pixi, or install %s with pip."
+    sys.exit("The paperspec tools need %s %s; run them through pixi, or install %s with pip."
              % ("the package" if len(_missing) == 1 else "the packages", " and ".join(_missing),
                 "it" if len(_missing) == 1 else "them"))