Small Fixes to Docs

[elazarlachkar]

Description

This pull request fixes 2 small things in Elementary's docs:

1. Removes the duplicated intro and user creation steps from the Postgres DWH page.
2. Changes the simple text Trino page to use a details card (like the ClickHouse and Athena pages).

Technical Changes

While running the docs server locally, I changed some technical minor things as well:

1. Removed version section from the docker-compose.yaml as it's obsolete, and added quotes to the published ports as recommended.
2. Upgraded Node version to solve the sharp module error on Linux runtime (v19 wasn't enough).
3. Removed the mintlify install command from Dockerfile, apparently it was removed on v4 (see v3.0.98 docs vs v4.0.3 docs).

Tests

• Built a new Docker image for the docs server.
• Served the docs server locally using Docker-Compose.
• Made sure the docs were changed as expected.

Notes for Reviewer

• This PR is obviously not very important, feel free to ignore if you don't have time to deploy the changes.
• I have no idea if the Trino "details card" subscription actually work, I just copied the ClickHouse URL and changed the query arg. Please validate it if you can.