add selfhosted links

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+### Communication
+
+[**SNM**](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/)
+:   Complete and simple NixOS mailserver
+
+[**Synapse**](https://matrix.org/docs/projects/server/synapse/)
+:   Matrix.org's reference server
+
+### DAV
+
+[**Radicale**](https://radicale.org/)
+:   Small but powerful CalDAV and CardDAV server
+
+### Newsfeeds
+
+[**Tiny Tiny RSS**](https://tt-rss.org/)
+:   Web-based news feed reader and aggregator
+
+### Version Control
+
+[**Gitea**](https://gitea.io/)
+:   Community managed lightweight code hosting solution written in Go