refactor(build): remove CMS_URL env var not needed at runtime

CMS_URL var configures the context path for the STRAPI CMS backend.
It is required at build time in order to make STRAPI internal routes work.
It is not needed in local development, as there no contextpath is required.

.env.example

@@ -11,7 +11,6 @@ NEXT_PRIVATE_STANDALONE=true
 NEXTAUTH_SECRET=testsecret
 
 CMS_DATABASE_NAME=vim_cms
-CMS_URL="https://preview.vim.org/cms"
 CMS_HOST=0.0.0.0
 CMS_PORT=1337
 CMS_APP_KEYS=testkey1,testkey2

docker-compose.dev.yml

@@ -39,7 +39,6 @@ services:
       DATABASE_USERNAME: ${DATABASE_USERNAME}
       DATABASE_PASSWORD: ${DATABASE_PASSWORD}
       DATABASE_SSL: false
-      CMS_URL: ${CMS_URL}
       HOST: ${CMS_HOST}
       PORT: ${CMS_PORT}
       APP_KEYS: ${CMS_APP_KEYS}