In the readme of this repository, there is a link to doxygen documentation. Clicking it loads a page that is mostly blank.

I checked the wayback machine for that URL and it seems to have always been that way. This is strange, since looking through the code, there are comments formatted to work with doxygen. So it seems to be some sort of CI configuration error.
This next part is a bit of a shot in the dark, but I may have spotted the problem. In an adafruit repository that has working docs, the .github/workflows/githubci.yml file's last line has an extra argument at the end run: bash ci/doxy_gen_and_deploy.sh src whereas in this repository its just run: bash ci/doxy_gen_and_deploy.sh
I could submit a pull request to test this idea if a maintainer tells me there's a chance it would be merged
Arduino board: N/a
Arduino IDE version 1.8.19 (but also not N/a)
In the readme of this repository, there is a link to doxygen documentation. Clicking it loads a page that is mostly blank.

I checked the wayback machine for that URL and it seems to have always been that way. This is strange, since looking through the code, there are comments formatted to work with doxygen. So it seems to be some sort of CI configuration error.
This next part is a bit of a shot in the dark, but I may have spotted the problem. In an adafruit repository that has working docs, the
.github/workflows/githubci.ymlfile's last line has an extra argument at the endrun: bash ci/doxy_gen_and_deploy.sh srcwhereas in this repository its justrun: bash ci/doxy_gen_and_deploy.shI could submit a pull request to test this idea if a maintainer tells me there's a chance it would be merged