[mod] container: replace uWSGI with Granian (#395)

To sync with https://github.com/searxng/searxng/pull/4820

Caddyfile

@@ -42,10 +42,6 @@ encode zstd gzip
 	path /stats/checker
 }
 
-@search {
-	path /search
-}
-
 @imageproxy {
 	path /image_proxy
 }
@@ -58,20 +54,17 @@ header {
 	# CSP (https://content-security-policy.com)
 	Content-Security-Policy "upgrade-insecure-requests; default-src 'none'; script-src 'self'; style-src 'self' 'unsafe-inline'; form-action 'self' https:; font-src 'self'; frame-ancestors 'self'; base-uri 'self'; connect-src 'self'; img-src * data:; frame-src https:;"
 
-	# Disable some browser features
+	# Disable browser features
 	Permissions-Policy "accelerometer=(),camera=(),geolocation=(),gyroscope=(),magnetometer=(),microphone=(),payment=(),usb=()"
 
-	# Set referrer policy
-	Referrer-Policy "no-referrer"
-
-	# Force clients to use HTTPS
-	Strict-Transport-Security "max-age=31536000"
+	# Only allow same-origin requests
+	Referrer-Policy "same-origin"
 
 	# Prevent MIME type sniffing from the declared Content-Type
 	X-Content-Type-Options "nosniff"
 
-	# X-Robots-Tag (comment to allow site indexing)
-	X-Robots-Tag "noindex, noarchive, nofollow"
+	# Comment header to allow indexing by search engines
+	X-Robots-Tag "noindex, nofollow, noarchive, nositelinkssearchbox, nosnippet, notranslate, noimageindex"
 
 	# Remove "Server" header
 	-Server
@@ -84,14 +77,10 @@ header @api {
 
 route {
 	# Cache policy
-	header Cache-Control "max-age=0, no-store"
-	header @search Cache-Control "max-age=5, private"
-	header @imageproxy Cache-Control "max-age=604800, public"
+	header Cache-Control "max-age=0, public, must-revalidate"
+	header @imageproxy Cache-Control "max-age=3600, public"
 	header @static Cache-Control "max-age=31536000, public, immutable"
 }
 
 # SearXNG
-reverse_proxy localhost:8080 {
-	# https://github.com/searx/searx-docker/issues/24
-	header_up Connection "close"
-}
+reverse_proxy localhost:8080