chore(k8s): router rewrite

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

downtify/k8s/ingress.yaml

@@ -7,7 +7,7 @@ spec:
   entryPoints:
     - websecure
   routes:
-    - match: HostRegexp(`^downtify\.forust\.xyz$`)
+    - match: Host(`downtify.forust.xyz`)
       kind: Rule
       middlewares:
         - name: security-chain@file
@@ -31,4 +31,3 @@ spec:
       services:
         - name: downtify-service
           port: 8000
-