[mod] remove option ui.static_use_hash (cache busting) (#5004)

Cache busting has caused serious problems for users in the past, here are two
examples:

- https://github.com/searxng/searxng/issues/4419
- https://github.com/searxng/searxng/issues/4481

And it makes development and deployment significantly more complex because it
binds the client side to the server side:

- https://github.com/searxng/searxng/pull/4466

In the light of a decoupled development of the WEB clients from the server side:

- https://github.com/searxng/searxng/pull/4988

is it appropriate to abandon this feature. In fact,  it has been ineffective
since #4436 anyway.

However, the benefit has always been questionable, since at best only a few kB
of data are saved (at least in the context of an image_proxy, the effect is below
the detection limit). Ultimately, the client is responsible for caching.

Related: https://github.com/searxng/searxng/issues?q=label%3A%22clear%20browser%20cache%22

Closes: https://github.com/searxng/searxng/pull/4466
Closes: https://github.com/searxng/searxng/issues/1326
Closes: https://github.com/searxng/searxng/issues/964

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

utils/templates/etc/httpd/sites-available/searxng.conf

@@ -33,9 +33,6 @@ LoadModule proxy_http_module    ${APACHE_MODULES}/mod_proxy_http.so
 
 </Location>
 
-# uWSGI serves the static files and in settings.yml we use::
-#
-#   ui:
-#     static_use_hash: true
+# To serve the static files via the HTTP server
 #
 # Alias ${SEARXNG_URL_PATH}/static/ ${SEARXNG_STATIC}/

utils/templates/etc/httpd/sites-available/searxng.conf:socket

@@ -33,9 +33,6 @@ LoadModule proxy_uwsgi_module   ${APACHE_MODULES}/mod_proxy_uwsgi.so
 
 </Location>
 
-# uWSGI serves the static files and in settings.yml we use::
-#
-#   ui:
-#     static_use_hash: true
+# To serve the static files via the HTTP server
 #
 # Alias ${SEARXNG_URL_PATH}/static/ ${SEARXNG_STATIC}/

utils/templates/etc/nginx/default.apps-available/searxng.conf

@@ -19,10 +19,7 @@ location ${SEARXNG_URL_PATH} {
 
 }
 
-# uWSGI serves the static files and in settings.yml we use::
-#
-#   ui:
-#     static_use_hash: true
+# To serve the static files via the HTTP server
 #
 # location ${SEARXNG_URL_PATH}/static/ {
 #     alias ${SEARXNG_STATIC}/;

utils/templates/etc/nginx/default.apps-available/searxng.conf:socket

@@ -16,10 +16,7 @@ location ${SEARXNG_URL_PATH} {
     uwsgi_param    HTTP_X_FORWARDED_FOR  \$proxy_add_x_forwarded_for;
 }
 
-# uWSGI serves the static files and in settings.yml we use::
-#
-#   ui:
-#     static_use_hash: true
+# To serve the static files via the HTTP server
 #
 # location ${SEARXNG_URL_PATH}/static/ {
 #     alias ${SEARXNG_STATIC}/;

utils/templates/etc/searxng/settings.yml

@@ -25,9 +25,6 @@ valkey:
   # URL to connect valkey database. Is overwritten by ${SEARXNG_VALKEY_URL}.
   url: valkey://localhost:6379/0
 
-ui:
-  static_use_hash: true
-
 # preferences:
 #   lock:
 #     - autocomplete

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

@@ -75,11 +75,7 @@ pythonpath = ${SEARXNG_SRC}
 http = ${SEARXNG_INTERNAL_HTTP}
 buffer-size = 8192
 
-# uWSGI serves the static files and in settings.yml we use::
-#
-#   ui:
-#     static_use_hash: true
-#
+# To serve the static files via the WSGI server
 static-map = /static=${SEARXNG_STATIC}
 static-gzip-all = True
 offload-threads = %k

utils/templates/etc/uwsgi/apps-archlinux/searxng.ini:socket

@@ -72,11 +72,7 @@ pythonpath = ${SEARXNG_SRC}
 socket = ${SEARXNG_UWSGI_SOCKET}
 buffer-size = 8192
 
-# uWSGI serves the static files and in settings.yml we use::
-#
-#   ui:
-#     static_use_hash: true
-#
+# To serve the static files via the WSGI server
 static-map = /static=${SEARXNG_STATIC}
 static-gzip-all = True
 offload-threads = %k

utils/templates/etc/uwsgi/apps-available/searxng.ini

@@ -78,11 +78,7 @@ pythonpath = ${SEARXNG_SRC}
 http = ${SEARXNG_INTERNAL_HTTP}
 buffer-size = 8192
 
-# uWSGI serves the static files and in settings.yml we use::
-#
-#   ui:
-#     static_use_hash: true
-#
+# To serve the static files via the WSGI server
 static-map = /static=${SEARXNG_STATIC}
 static-gzip-all = True
 offload-threads = %k

utils/templates/etc/uwsgi/apps-available/searxng.ini:socket

@@ -75,11 +75,7 @@ pythonpath = ${SEARXNG_SRC}
 socket = ${SEARXNG_UWSGI_SOCKET}
 buffer-size = 8192
 
-# uWSGI serves the static files and in settings.yml we use::
-#
-#   ui:
-#     static_use_hash: true
-#
+# To serve the static files via the WSGI server
 static-map = /static=${SEARXNG_STATIC}
 static-gzip-all = True
 offload-threads = %k