Tidy up AppApi example

Signed-off-by: Kaloyan Nikolov <tzerber@gmail.com>

Author: tzerber

.examples/appapi/Dockerfile …xamples/docker-compose/appapi/Dockerfile.examples/appapi/Dockerfile renamed to .examples/docker-compose/appapi/Dockerfile .examples/appapi/Dockerfile renamed to .examples/docker-compose/appapi/Dockerfile

@@ -64,7 +64,7 @@ This Dockerfile:
 ```yaml
 services:
   db:
-    image: postgres:16-alpine
+    image: postgres:18-alpine
     restart: unless-stopped
     volumes:
       - db:/var/lib/postgresql/data:Z

.examples/appapi/README.md .examples/docker-compose/appapi/README.md.examples/appapi/README.md renamed to .examples/docker-compose/appapi/README.md

@@ -1,6 +1,9 @@
 services:
+  # Note: PostgreSQL is an external service. You can find more information about the configuration here:
+  # https://hub.docker.com/_/postgres
   db:
-    image: postgres:16-alpine
+    image: postgres:18-alpine
+    # Note: Check the recommend version here: https://docs.nextcloud.com/server/latest/admin_manual/installation/system_requirements.html#server
     restart: unless-stopped
     volumes:
       - db:/var/lib/postgresql/data:Z
@@ -28,10 +31,14 @@ services:
       - db
       - redis
 
+  # Note: Redis is an external service. You can find more information about the configuration here:
+  # https://hub.docker.com/_/redis
   redis:
     image: redis:alpine
     restart: unless-stopped
-
+  
+  # Note: Nginx is an external service. You can find more information about the configuration here:
+  # https://hub.docker.com/_/nginx/
   web:
     image: nginx:alpine
     restart: unless-stopped