docs: write a system setup guide for linux

[lnielsen]

Write a system setup guide for Linux (see https://invenio.readthedocs.io/en/master/getting-started/development-environment.html#linux).Use the macOS example on the same page as a template.

I would think we would likely need to split the guide into

• Ubuntu/Debian
• CentOS

Create a VM with the system (CentOS or Ubuntu/Debian) to test with so that we don't forget important things for newcomers.