global: full documentation validation

The objective of this issue is to validate the entire v3.2 release from an end-user perspective.

Validate here means:
- Verify that all instructions works and output is consistent with what is displayed
- Verify that it makes sense from an overall perspective.

- Validate "Get started" on [inveniosoftware.org](https://inveniosoftware.org/products/framework/)
- Validate [Invenio Framework documentation](https://invenio.readthedocs.io/en/latest/):
- Read and validate each chapter of the documentation. Does it work? Does it make sense? Is it consistent with the rest of the documentation?

Start with the “Get started” content on inveniosoftware.org, then read each chapter of the Invenio Framework documentation at invenio.readthedocs.io/en/latest/. Check that every instruction works, outputs match what is shown, and the documentation is coherent and consistent overall. Done means recording and addressing all validation findings across the v3.2 documentation.

Written by the indexing model from the issue text.