chore(k8s): router rewrite

- returned to Host matcher instead of Hostregexp
- switched dockercompose labels to letsencrypt
- renamed DoH route

searxng/k8s/ingress.yaml

@@ -7,7 +7,7 @@ spec:
   entryPoints:
     - websecure
   routes:
-    - match: HostRegexp(`^(s|search)\.forust\.xyz$`)
+    - match: Host(`s.forust.xyz`) || Host(`search.forust.xyz`)
       kind: Rule
       services:
         - name: searxng-service