[docs] Brush up the documentation

* Try to organize after expected user need
* Update mkdocs stuff and fix a broken link
* Move web building info to building.md
* Add info about Roku Soundbridge
* Add note about Google Nest not working

docs/control-clients/desktop.md

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+# Desktop Remote Control
+
+To control OwnTone from Linux, Windows or Mac, you can use:
+
+- [The web interface](#the-web-interface)
+- [A remote for iTunes/Apple Music](#remotes-for-itunesapple-music)
+- [A MPD client](#mpd-clients)
+
+The web interface is the most feature complete and works on all platforms, so
+on desktop there isn't much reason to use anything else.
+
+However, instead of a remote control application, you can also connect to
+OwnTone via a Media Client e.g. iTunes or Apple Music. Media clients will get
+the media from OwnTone and do the playback themselves (remotes just control
+OwnTone playback). See [Media Clients](../media-clients.md) for more
+information.
+
+
+## The web interface
+
+See [web interface](web.md).
+
+
+## Remotes for iTunes/Apple Music
+
+There are only a few of these, see the below table.
+
+|          Client          | Developer   |  Type  |   Platform      | Working (vers.) |
+| ------------------------ | ----------- | ------ | --------------- | --------------- |
+| TunesRemote SE           |             | Remote | Java            | Yes (r108)      |
+| rtRemote for Windows     | bizmodeller | Remote | Windows         | Yes (1.2.0.67)  |
+
+
+## MPD clients
+
+There's a range of MPD clients available that also work with OwnTone e.g.
+Cantata and Plattenalbum.
+ 
+The better ones support local playback, speaker control, artwork and automatic
+discovery of OwnTone's MPD server.
+
+By default OwnTone listens on port 6600 for MPD clients. You can change
+this in the configuration file.
+
+Due to some differences between OwnTone and MPD not all commands will act the
+same way they would running MPD:
+
+- crossfade, mixrampdb, mixrampdelay and replaygain will have no effect
+- single, repeat: unlike MPD, OwnTone does not support setting single and repeat
+  separately on/off, instead repeat off, repeat all and repeat single are
+  supported. Thus setting single on will result in repeat single, repeat on
+  results in repeat all.