docs(web): fix SearXNG env configuration

tools/web_providers/searxng.py

@@ -5,10 +5,11 @@ It implements ``WebSearchProvider`` only — there is no extract capability.
 
 Configuration::
 
-    # ~/.hermes/config.yaml  (SEARXNG_URL is a URL, not a secret — use config.yaml not .env)
-    SEARXNG_URL: http://localhost:8080
+    # ~/.hermes/.env
+    SEARXNG_URL=http://localhost:8080
 
     # Use SearXNG for search, pair with any extract provider:
+    # ~/.hermes/config.yaml
     web:
       search_backend: "searxng"
       extract_backend: "firecrawl"

website/docs/user-guide/features/web-search.md

@@ -148,8 +148,15 @@ You should see something like `10 results`. If you get a `403 Forbidden`, JSON f
 **7. Configure Hermes:**
 
 ```bash
-# ~/.hermes/config.yaml
-SEARXNG_URL: http://localhost:8888
+# ~/.hermes/.env
+SEARXNG_URL=http://localhost:8888
+```
+
+Then select SearXNG as the search backend in `~/.hermes/config.yaml`:
+
+```yaml
+web:
+  search_backend: "searxng"
 ```
 
 Or set via `hermes tools` → Web Search & Extract → SearXNG.
@@ -161,8 +168,8 @@ Or set via `hermes tools` → Web Search & Extract → SearXNG.
 Public SearXNG instances are listed at [searx.space](https://searx.space/). Filter by instances that have **JSON format enabled** (shown in the table).
 
 ```bash
-# ~/.hermes/config.yaml
-SEARXNG_URL: https://searx.example.com
+# ~/.hermes/.env
+SEARXNG_URL=https://searx.example.com
 ```
 
 :::caution Public instances