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/pipewire.1.md

@@ -0,0 +1,44 @@
+\page page_man_pipewire_1 pipewire
+
+The PipeWire media server
+
+# SYNOPSIS
+
+**pipewire** \[*options*\]
+
+# DESCRIPTION
+
+PipeWire is a service that facilitates sharing of multimedia content
+between devices and applications.
+
+The **pipewire** daemon reads a config file that is further documented
+in \ref page_man_pipewire_conf_5 "pipewire.conf(5)" manual page.
+
+# OPTIONS
+
+\par -h | \--help
+Show help.
+
+\par -v | \--verbose
+Increase the verbosity by one level. This option may be specified
+multiple times.
+
+\par \--version
+Show version information.
+
+\par -c | \--config=FILE
+Load the given config file (Default: pipewire.conf).
+
+# AUTHORS
+
+The PipeWire Developers <$(PACKAGE_BUGREPORT)>;
+PipeWire is available from <$(PACKAGE_URL)>
+
+# SEE ALSO
+
+\ref page_man_pw-top_1 "pw-top(1)",
+\ref page_man_pw-dump_1 "pw-dump(1)",
+\ref page_man_pw-mon_1 "pw-mon(1)",
+\ref page_man_pw-cat_1 "pw-cat(1)",
+\ref page_man_pw-cli_1 "pw-cli(1)",
+\ref page_man_libpipewire-modules_7 "libpipewire-modules(7)"