remove unneeded volume mount (#652)

Wiki.js stores all data in the database, mounting this directory prevents updating the app via docker, because it contains the server code itself. See https://docs.requarks.io/en/install/docker#using-docker-compose.

public/v4/apps/wiki-js.yml

@@ -18,8 +18,6 @@ services:
             DB_NAME: wiki
         image: requarks/wiki:$$cap_version
         restart: always
-        volumes:
-            - $$cap_appname-data:/wiki
         caproverExtra:
             containerHttpPort: '3000'
 caproverOneClickApp: