refactor: simplify SearXNG service configuration in Docker setup

- Consolidated volume mappings for SearXNG to use a single directory.
- Removed unnecessary port mappings and legacy data volume definitions.
- Updated web search service documentation to clarify Redis usage and circuit breaker implementation, eliminating Redis dependency for circuit breaker logic.

docker/docker-compose.yml

@@ -45,14 +45,9 @@ services:
   searxng:
     image: searxng/searxng:2024.12.23
     volumes:
-      - ./searxng/settings.yml:/etc/searxng/settings.yml:ro
-      - ./searxng/limiter.toml:/etc/searxng/limiter.toml:ro
-      - searxng_data:/etc/searxng
+      - ./searxng:/etc/searxng
     environment:
-      SEARXNG_BASE_URL: http://localhost:${SEARXNG_PORT:-8888}/
       SEARXNG_SECRET: ${SEARXNG_SECRET:-surfsense-searxng-secret}
-    ports:
-      - "${SEARXNG_PORT:-8888}:8080"
     restart: unless-stopped
     healthcheck:
       test: ["CMD", "wget", "--spider", "-q", "http://localhost:8080/healthz"]
@@ -215,5 +210,3 @@ volumes:
     name: surfsense-redis
   shared_temp:
     name: surfsense-shared-temp
-  searxng_data:
-    name: surfsense-searxng