neo_doxygen: Make the command user-friendly.

Signed-off-by: Jean-Christophe Beaupré <jcbrinfo@users.noreply.github.com>
neo_doxygen: Document the `Makefile`.

Signed-off-by: Jean-Christophe Beaupré <jcbrinfo@users.noreply.github.com>
neo_doxygen: Check the project’s name.

Signed-off-by: Jean-Christophe Beaupré <jcbrinfo@users.noreply.github.com>
neo_doxygen: Enhance the display of the progression.

Signed-off-by: Jean-Christophe Beaupré <jcbrinfo@users.noreply.github.com>