Fix: run rtd pre-build script after install

Running this before the other commands is incorrect. It requires
`scriv`, which therefore requires that doc requirements are installed.

.readthedocs.yml

@@ -11,9 +11,9 @@ build:
   # use 'uv pip install' to apply build customization in a pip-compatible way
   # see: https://docs.readthedocs.io/en/stable/build-customization.html#install-dependencies-with-uv
   commands:
-    - bash ./scripts/rtd-pre-sphinx-build.sh
     - asdf plugin add uv
     - asdf install uv latest
     - asdf global uv latest
     - uv pip install . -r "requirements/py3.11/docs.txt"
+    - bash ./scripts/rtd-pre-sphinx-build.sh
     - uv run -m sphinx -T -b html -d docs/_build/doctrees -D language=en docs $READTHEDOCS_OUTPUT/html