[stable/zed] Switch docs to Sphinx

[vexxhost-bot]

Manual cherrypick required.

#1166 failed to apply on top of branch "stable/zed":

Applying: Switch docs to Sphinx
error: patch failed: docs/kubernetes/certificates.md:1
error: docs/kubernetes/certificates.md: patch does not apply
error: Did you hand edit your patch?
It does not apply to blobs recorded in its index.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Using index info to reconstruct a base tree...
M	galaxy.yml
M	poetry.lock
M	pyproject.toml
Patch failed at 0001 Switch docs to Sphinx
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".