[mod] Serving static files with uWSGI (searxng.ini)

1. Serving static files with uWSGI by using static file mount points [1].
2. Expires set to one year since there are hashes [2]

[1] https://uwsgi-docs.readthedocs.io/en/latest/StaticFiles.html#mode-3-using-static-file-mount-points
[2] https://github.com/searxng/searxng/pull/932



Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>