Missing postgresql dependency in documentation

At https://biscuit.edugit.io/BiscuIT-ng/docs/html/dev/01_setup.html

added part::docs prio::3 labels

PostgreSQL sudo apt install postgresql libpq5 libpq-dev

Python sudo apt install python3-dev libpython3.8-dev python3.8-dev

Yarn sudo apt install yarnpkg

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closed via commit 2e5d30be

mentioned in commit 2e5d30be