Enables caldav via reverse proxy (#96)

* Adds reverse proxy for Caldav

Adds reverse proxy configuration for /caldav/ running in kopano_ical container

docker-compose.yml

@@ -367,6 +367,7 @@ services:
       - kopano_ical.env
     networks:
       - kopano-net
+      - web-net
 
   kopano_monitor:
     image: ${docker_repo:?err}/kopano_core:${CORE_VERSION}