[docs] Split docs into multiple files and publish with gh-actions

docs/outputs/airplay.md

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+# AirPlay devices/speakers
+
+OwnTone will discover the AirPlay devices available on your network. For
+devices that are password-protected, the device's AirPlay name and password
+must be given in the configuration file. See the sample configuration file
+for the syntax.
+
+If your Apple TV requires device verification (always required by Apple TV4 with
+tvOS 10.2) then you can do that through Settings > Remotes & Outputs in the web
+interface: Select the device and then enter the PIN that the Apple TV displays.
+
+If your speaker is silent when you start playback, and there is no obvious error
+message in the log, you can try disabling ipv6 in the config. Some speakers
+announce that they support ipv6, but in fact don't (at least not with forked-
+daapd).
+
+If the speaker becomes unselected when you start playback, and you in the log
+see "ANNOUNCE request failed in session startup: 400 Bad Request", then try
+the Apple Home app > Allow Speakers & TV Access > Anyone On the Same Network
+(or Everyone).