doc: Convert manpages to rst

This will make it more fun to add details and more manpages.

doc/feedbackd.rst

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+.. _feedbackd(8):
+
+=========
+feedbackd
+=========
+
+--------------------------------------
+A daemon to provide feedback on events
+--------------------------------------
+
+SYNOPSIS
+--------
+|   **feedbackd** [OPTIONS...]
+
+
+DESCRIPTION
+===========
+
+``Feedbackd`` is a daemon that runs in the users session to trigger
+event feedback such as playing a sound, trigger a haptic motor or blink
+a LED.
+
+The feedback triggered by a given event is determined by the feedback theme in
+use. Events are submitted via a DBus API.
+
+Any feedback triggered by a client via an event will be stopped latest when the
+client disconnects from DBus. This makes sure all feedbacks get canceled if the
+app that triggered it crashes.
+
+For details refer to the event and feedback theme specs at
+`<https://source.puri.sm/Librem5/feedbackd/>`__
+
+Options
+=======
+
+``-h``, ``--help``
+   print help and exit
+
+See also
+========
+
+``fbcli(1)``