Resolve "put the fusiondirectory.conf manpage in the official documentation"

See merge request fusiondirectory/user-manual!373

(cherry picked from commit b6ef7e75)

09f6516e ✨ feat(conf) put the fusiondirectory.conf manpage in the official documentation
b197a7fd 🚑 fix(code-block) added xml to make code-block happy on ci
548bc508 🚑 fix(xml) put the fusiondirectory.conf manpage in the official documentation