docs: update PostgreSQL data path in Docker documentation (#565)

- Changed the PostgreSQL data volume mount path from `/node/postgres` to `/var/lib/postgresql/data` in the Docker readme and installation documentation.
- Updated relevant descriptions to reflect the new path.

Author: linconvidal

docker/readme.md

@@ -62,10 +62,10 @@ If you want to use already existing cardano data, you can mount the data volume
 
 ### 6. Volume with Postgres data
 ````
-docker run --env-file .\docker\.env.dockerfile --env-file ./docker/.env.docker-profile-mid-level -p 8082:8082 -v {custom_folder}:/node/postgres --shm-size=4g -d {image_name}:latest
+docker run --env-file .\docker\.env.dockerfile --env-file ./docker/.env.docker-profile-mid-level -p 8082:8082 -v {custom_folder}:/var/lib/postgresql/data --shm-size=4g -d {image_name}:latest
 ````
 
-You can mount a volume with Postgres node data to ``/node/postgres`` point to use already existed data.  
+You can mount a volume with Postgres node data to ``/var/lib/postgresql/data`` point to use already existed data.  
 If the mounted volume does not contain the database or empty, new database will be created there.
 
 ### 7. Volume with custom network configurations

docs/docs/install-and-deploy/docker.md

@@ -227,12 +227,12 @@ docker restart yaci-indexer
 
 ### Important Container Paths
 
-| Path             | Description                |
-| ---------------- | -------------------------- |
-| `/node/db`       | Cardano Node Data          |
-| `/node/postgres` | PostgreSQL Data            |
-| `/networks`      | Network config location    |
-| `/logs`          | Log files for each service |
+| Path                       | Description                |
+| -------------------------- | -------------------------- |
+| `/node/db`                 | Cardano Node Data          |
+| `/var/lib/postgresql/data` | PostgreSQL Data            |
+| `/networks`                | Network config location    |
+| `/logs`                    | Log files for each service |
 
 ## Running Integration Tests