Fixup INSTALL.md

- add a big fat warning
- Do not mentioned the deprecated docker setup anymore
- Fixup docker-compose production setup

docker-compose.yml.production-example

@@ -1,29 +1,32 @@
 version: "2"
 
 services:
-  database:
+  production_database:
     image: postgres
     environment:
       PGDATA: /var/lib/postgresql/data/pgdata
     volumes:
-      - database:/var/lib/postgresql/data/pgdata
-  osem:
-    build: .
-    dockerfile: Dockerfile.production
-    env_file: .env.production # see dotenv.example file
+      - osem_production_database:/var/lib/postgresql/data/pgdata
+  production_web:
+    build:
+      context: .
+      dockerfile: Dockerfile.production
     depends_on:
-      - database
+      - production_database
     ports:
-      - 3000:3000
+      - 8080:3000
+    env_file: .env.production # see dotenv.example file
+    environment:
+     OSEM_DB_HOST: production_database
+    command: /osem/bin/osem-init.sh
     volumes:
-      - .:/osem
-      - web-data:/osem/public/system
-      - web-assets:/osem/public/assets
-      - web-logs:/osem/log
+      - osem_production_web_data:/osem/public/system
+      - osem_production_web_assets:/osem/public/assets
+      - osem_production_web_logs:/osem/log
 
 # named volumes to persist data
 volumes:
-  database:
-  web-data:
-  web-assets:
-  web-logs:
+  osem_production_database:
+  osem_production_web_data:
+  osem_production_web_assets:
+  osem_production_web_logs: