Mumble project homepage

[Robert Adam]

Hello,

My name is Robert and I am a core-developer of the Mumble project. I 
just realized that the package in the Ubuntu (focal) repository for 
mumble and mumble-server lists the Mumble wiki as the homepage of the 
project.

Our (long-term) plan is to remove the wiki (and move docs to a different 
page) and thus this link will most likely end up dangling. Instead I 
suggest that you could add the project's actual homepage 
(https://www.mumble.info/) to the package's meta-information.

Thanks
   Robert