The old searx theme was a copy of the flask theme. In the meantime this theme
is available from the python module pallets-sphinx-themes.
This patch makes pallets-sphinx-themes as a (dev) requirement and drops most of
the old and obsolete searx theme settings/files.
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Markus Heiser