Update caddy.md (#100)

Fix http01-challenge for certs

docs/install/reverse-proxies/caddy.md

@@ -64,6 +64,7 @@ services:
         restart: always
         ports:
             - '0.0.0.0:443:443'
+            - '0.0.0.0:80:80'
         networks:
             - remnawave-network
         volumes: