++ fix: update .env.example and README.md, add CreateInitialAdmin command, update docker-compose.yml and entrypoint.sh, remove old CSS file and update manifest.json

docker-compose.yml

@@ -25,6 +25,10 @@ services:
       - PHP_OPCACHE_VALIDATE_TIMESTAMPS=1
       - SEED_DEV_DATA=${SEED_DEV_DATA:-false}
       - RUN_DB_SEED_ON_FIRST_START=${RUN_DB_SEED_ON_FIRST_START:-true}
+      - ENSURE_INITIAL_ADMIN_ON_EMPTY_DB=${ENSURE_INITIAL_ADMIN_ON_EMPTY_DB:-true}
+      - INITIAL_ADMIN_NAME=${INITIAL_ADMIN_NAME:-}
+      - INITIAL_ADMIN_EMAIL=${INITIAL_ADMIN_EMAIL:-}
+      - INITIAL_ADMIN_PASSWORD=${INITIAL_ADMIN_PASSWORD:-}
 
   nginx:
     build: