doc: make all manpages with Doxygen

Use (fixed-up) Doxygen manpage output for all program & module manpages.

This also allows formatting the manual pages properly in the HTML docs.

The Markdown pages work properly only with Doxygen >= 1.9.7, older
versions put them to wrong place in the HTML docs.

doc/dox/programs/pw-profiler.1.md

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+\page page_man_pw-profiler_1 pw-profiler
+
+The PipeWire profiler
+
+# SYNOPSIS
+
+**pw-profiler** \[*options*\]
+
+# DESCRIPTION
+
+Start profiling a PipeWire instance.
+
+If the server has the profiler module loaded, this program will connect
+to it and log the profiler data. Profiler data contains times and
+durations when processing nodes and devices started and completed.
+
+When this program is stopped, a set of **gnuplot** files and a script to
+generate SVG files from the .plot files is generated, along with a .html
+file to visualize the profiling results in a browser.
+
+This function uses the same data used by *pw-top*.
+
+# OPTIONS
+
+\par -r | \--remote=NAME
+The name the remote instance to monitor. If left unspecified, a
+connection is made to the default PipeWire instance.
+
+\par -h | \--help
+Show help.
+
+\par \--version
+Show version information.
+
+\par -o | \--output=FILE
+Profiler output name (default "profiler.log").
+
+# AUTHORS
+
+The PipeWire Developers <$(PACKAGE_BUGREPORT)>;
+PipeWire is available from <$(PACKAGE_URL)>
+
+# SEE ALSO
+
+\ref page_man_pipewire_1 "pipewire(1)",
+\ref page_man_pw-top_1 "pw-top(1)"