index.html: added Matrix-protocol chatrooms for Maneage

Until now, the only way we had suggested for interested viewers to get
in touch with us was through Savannah. But that interface can be a
little too technical for some interested people.

With this commit, the Savannah part has been commented (not shown in
the top page), and instead some Matrix-protocol chat rooms have been
introduced to help new users easily contact us.

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