This change add support for retrieving and applying release notes to
the broader docs interface after creating a release through the github
interface. This in turn creates a PR to merge that includes md documentation
that tracks the release notes.

This is part 1 of 2 commits to incrementally support multiversion releases.

…build is stable

… spec

This is the second portion of a commit to release docs. We take
tagged releases and then generate release notes that are then
stored in docs release so they can be viewed from the documentaiton
site. We also generate a snapshot of the documents so we can support
multiple versions going back in time.

Finally, we add support for next, which are so we can see changes
that have been added to main but have not been released yet. This
will make it easy to then understand the documentation.

Additionally, we must have a follow up PR that adds the release
notes to the doc site, as this is cleaner than needing to publish
to update the release notes everytime. This will allow for one off
typo changes that don't need to go through the release process
from scratch but can just be committed into mainline.