Links to Doxygen broken

We use Doxygen in our code to add some documentation, but the links to the generated docs at https://doc.manasource.org/#developers-documentation are broken. To fix them, we could make sure that this part of the website is generated as part of either the following CI scripts:

• doc.manasource.org: https://gitlab.com/manasource/manasource-doc/-/blob/master/.gitlab-ci.yml?ref_type=heads
• manasource.org: https://gitlab.com/manasource/manasource.gitlab.io/-/blob/master/.gitlab-ci.yml?ref_type=heads

While the links currently point to manasource.org, I think building the Doxygen as part of doc.manasource.org would make more sense.