cmus{fm,-remote}: add pages; cmus: move to common (#21308)

pages/common/cmus-remote.md

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+# cmus-remote
+
+> Control `cmus`.
+> See also: `playerctl`.
+> More information: <https://manned.org/cmus-remote>.
+
+- [Q]uery player status information:
+
+`cmus-remote -Q`
+
+- Toggle playback:
+
+`cmus-remote {{[-u|--pause]}}`
+
+- Skip to the next song:
+
+`cmus-remote {{[-n|--next]}}`
+
+- Skip back to the previous song:
+
+`cmus-remote {{[-r|--prev]}}`
+
+- Execute a `cmus` command:
+
+`cmus-remote {{[-C|--raw]}} "{{set repeat?}}"`

pages/common/cmusfm.md

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+# cmusfm
+
+> Scrobble tracks from the `cmus` music player to Last.fm.
+> More information: <https://github.com/Arkq/cmusfm#configuration>.
+
+- Initialize `cmusfm` and authorize access to your account:
+
+`cmusfm init`
+
+- Display help:
+
+`cmusfm`