docker: use prebuilt docker images for quickstart script.

Use the prebuilt Docker images instead of building them locally in the
Docker Compose script. This is faster, but it means that local changes
to the code will be ignored.

config/docker/docker-compose.simple.yaml

@@ -19,10 +19,10 @@ version: "3.4"
 
 services:
   danbooru:
-    # image: evazion/danbooru
+    image: evazion/danbooru
-    build:
+    # build:
-      context: ../..
+    #  context: ../..
-      dockerfile: config/docker/Dockerfile.danbooru
+    #  dockerfile: config/docker/Dockerfile.danbooru
     ports:
       - "80:3000"
     environment:
@@ -38,10 +38,10 @@ services:
     user: root
 
   postgres:
-    # image: evazion/postgres
+    image: evazion/postgres
-    build:
+    # build:
-      context: .
+    #  context: .
-      dockerfile: Dockerfile.postgres
+    #  dockerfile: Dockerfile.postgres
     environment:
       POSTGRES_USER: danbooru
       POSTGRES_HOST_AUTH_METHOD: trust