Investigate pull/merge request integration

[bollwyvl]

Problem

For files-at-rest, it would be nice if we could show inline annotations for findings, a la CodeQL, etc.

Proposed Solution

Investigate whether this already works. We could try this with e.g. pytest-github-actions-annotate-failures.

If it Just Works, add it to the documentation.

If it doesn't, investigate how to make it work with existing tools.

If that doesn't work, try to figure out how to generate appropriate output for GitHub/Lab.

As a bonus, it would be lovely to also get "sourcemaps," for built content... but that's... really hard.

Additional context

c/f https://github.com/jupyter/accessibility/issues/139#issuecomment-1710460686