Make CapitanoDoc output *.markdown files

doc/notes/set.markdown

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+# note <|note>
+
+Use this command to set or update a device note.
+
+If note command isn't passed, the tool attempts to read from `stdin`.
+
+To view the notes, use $ resin device <id>.
+
+Examples:
+
+	$ resin note "My useful note" --device 317
+	$ cat note.txt | resin note --device 317
+
+## Options
+
+### --device, --d,dev, --d,dev <device>
+
+device id