fix rocket config and add ./web as a volume in docker-compose.yml

docker-compose.yml.example

@@ -19,10 +19,15 @@ services:
       - PG_HOST=db
       - PG_USER=postgres
       - PG_PASSWORD=mysecretpassword
-      - ADDRESS=0.0.0.0:8000
+      - ROCKET_ADDRESS=0.0.0.0
+      - ROCKET_PORT=8000
       - RUST_LOG=debug
 
       - ROCKET_SECRET_KEY="openssl rand -base64 32"
+    volumes:
+      - type: bind
+        source: ./web
+        target: /srv/web
 # The commented out section below is an example of how to define a PostgreSQL
 # database that your application can use. `depends_on` tells Docker Compose to
 # start the database before your application. The `db-data` volume persists the