Merge pull request #56 from sphinx-notes/incrbuild

Incrbuild attempt 2

ci: Use image ubuntu-latest

Increase traceback length

Bump default python version from 3.10 -> 3.12

As 3.10 is not longer actively supported.
See also https://endoflife.date/python

Use original actions/upload-pages-artifact (#38)

Since actions/upload-pages-artifact#94 is
merged.

docs: Set trigger branch

docs: Move beta warning ahead

docs: Use domain sphinx.silverrainz.me

Correct dir name

Fix EXTRA_FILES