Rebecca,
I have not setup or integrated a Doxygen build as part of this. I think that is something that should happen and it should be done by a cloud build on a regular cadence but is independent of getting phase 1 CI up and running.
I would like to see a comprehensive plan for documentation. Spell check, image support, content other than code comments, and finally a defined expectation for contributions along with the code would be my initial requirements. Also hosting stable tag versions as well as master version. I think this can be its own RFC.
Thanks
Sean