Update pgAdmin image and add VS Code settings file

Switched the pgAdmin image in the docker-compose file to use the elestio/pgadmin:latest version for better maintenance and updates. Added an empty `.vscode/settings.json` file to support future editor configuration.

.vscode/settings.json

@@ -0,0 +1 @@
+{}

docker-compose.yaml

@@ -1,7 +1,7 @@
 services:
     pgadmin:
         container_name: pgadmin
-        image: dpage/pgadmin4:9.12.0
+        image: elestio/pgadmin:latest
         restart: unless-stopped
         environment:
             PGADMIN_DEFAULT_EMAIL: ${PGADMIN_DEFAULT_EMAIL:-admin@example.com}