docs: improve description of uwsgi & ngingx setup

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

utils/templates/etc/uwsgi/apps-archlinux/searx.ini

@@ -57,10 +57,24 @@ virtualenv = ${SEARX_PYENV}
 pythonpath = ${SEARX_SRC}
 
 
-# plugin http
-# -----------
+# speak to upstream
+# -----------------
+#
+# Activate the 'http' configuration for filtron or activate the 'socket'
+# configuration if you setup your HTTP server to use uWSGI protocol via sockets.
+
+# using IP:
 #
 # https://uwsgi-docs.readthedocs.io/en/latest/Options.html#plugin-http
-
 # Native HTTP support: https://uwsgi-docs.readthedocs.io/en/latest/HTTP.html
+
 http = ${SEARX_INTERNAL_URL}
+
+# using unix-sockets:
+#
+# On some distributions you need to create the app folder for the sockets::
+#
+#   mkdir -p /run/uwsgi/app/searx/socket
+#   chmod -R ${SERVICE_USER}:${SERVICE_GROUP}  /run/uwsgi/app/searx/socket
+#
+# socket = /run/uwsgi/app/searx/socket