feat: switch to getgrav/grav 2.0 RC docker image

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -1,13 +1,12 @@
 services:
   grav:
-    image: lscr.io/linuxserver/grav:latest
+    image: getgrav/grav
     container_name: intotheeast_grav
     environment:
-      - PUID=1000
-      - PGID=1000
+      - GRAV_CHANNEL=beta
     ports:
       - "8081:80"
     volumes:
-      - ./user:/config/www/user
-      - ./php/php-local.ini:/config/php/php-local.ini
+      - ./user:/var/www/html/user
+      - ./php/php-local.ini:/usr/local/etc/php/conf.d/php-local.ini
     restart: unless-stopped