[docs] Update wrong file extension used in mv command (ToolJet#2583)

* [docs] Update wrong file extension used in mv command

* Rename docker-compose extension to fit README

Author: MithunKinarullathil

deploy/docker/docker-compose-postgres.yml renamed to deploy/docker/docker-compose-postgres.yaml

@@ -39,7 +39,7 @@ OR
 For PostgreSQL database setup with persistent volume:
 ```bash
 curl -LO https://raw.githubusercontent.com/ToolJet/ToolJet/main/deploy/docker/docker-compose-postgres.yaml
-mv docker-compose-postgres.yml docker-compose.yml
+mv docker-compose-postgres.yaml docker-compose.yaml
 mkdir postgres_data
 ```