GLOG user guide is not visible in online documentation

[RippeR37]

When opening the documentation on GitHub Pages, then navigating to Logging page, the GLOG's user guide section is empty.

[RippeR37]

This seems to be reproducing only when building the documentation with sphinx-multiversion (currently only on CI/GitHub Workflow) and does NOT happen when building it locally.

After some debugging, it seems that the reason for this is that sphinx-multiversion uses git archive to "check-out" different branches and tags of the repository and this tool doesn't support checking-out submodules, so the README file from GLOG library is simply not accessible in that setup, hence the empty section.

• Working with git submodules sphinx-contrib/multiversion#48
• https://git-scm.com/docs/git-archive