Add Discourse, remove Loomio, remove mailinglists [ci skip]

closes #7387

README.md

@@ -12,8 +12,7 @@
 [Project site](https://diasporafoundation.org) |
 [Wiki](https://wiki.diasporafoundation.org) |
 [Bugtracker](https://github.com/diaspora/diaspora/issues) |
-[Discussions](https://www.loomio.org/groups/194) |
-[Mailing lists](https://wiki.diasporafoundation.org/How_We_Communicate#Mailing_Lists) |
+[Discussions and Support](https://discourse.diasporafoundation.org/) |
 [License](/COPYRIGHT) |
 [Authors](https://github.com/diaspora/diaspora/contributors)
 
@@ -31,9 +30,9 @@ Still haven't found an answer? Talk to us! Read [how we communicate](https://wik
 
 ## Contribute
 
-To keep diaspora*  growing and improving we need all help we can get. Whether you can contribute [code](https://wiki.diasporafoundation.org/Getting_started_with_contributing), [ideas](https://wiki.diasporafoundation.org/How_we_communicate#Loomio), [translations](https://wiki.diasporafoundation.org/Contribute_translations), [bug reports](https://wiki.diasporafoundation.org/How_to_report_a_bug) or simply extend the community as a [helpful user](https://wiki.diasporafoundation.org/Welcoming_committee) or [pod administrator](https://wiki.diasporafoundation.org/Installation), your help is welcome!
+To keep diaspora\* growing and improving we need all help we can get. Whether you can contribute [code](https://wiki.diasporafoundation.org/Getting_started_with_contributing), [ideas](https://wiki.diasporafoundation.org/How_we_communicate#Discourse), [translations](https://wiki.diasporafoundation.org/Contribute_translations), [bug reports](https://wiki.diasporafoundation.org/How_to_report_a_bug) or simply extend the community as a [helpful user](https://wiki.diasporafoundation.org/Welcoming_committee) or [pod administrator](https://wiki.diasporafoundation.org/Installation), your help is welcome!
 
-Everyone interacting in diaspora’s codebases, issue trackers, chat rooms, mailing lists, the wiki, and the Loomio group is expected to follow the diaspora\* [code of conduct](/CODE_OF_CONDUCT.md).
+Everyone interacting in diaspora’s codebases, issue trackers, chat rooms, the wiki, and the Discourse is expected to follow the diaspora\* [code of conduct](/CODE_OF_CONDUCT.md).
 
 ## Security