Change remaining privacy-browser references to mullvad-browser

The ones I can think of are for example the git repository for Firefox.

Also, we can switch from SSH to HTTPS, to make sure everyone can build with tor-browser-build.

added Doing label

assigned to @pierov

added Build System label

mentioned in merge request tor-browser-build!698 (merged)

changed the description

removed Doing label

closed

mentioned in issue tor-browser-build#40838 (closed)