[Docs] usage.md needs to be updated with GHA CI in PRs

[vjeeva]

It has grown out of date, mainly due to tiangolo/typer-cli#120.

typer-cli is used to generate the usage docs, but the version pins on that are very outdated, since we use the latest typer v0.9.0.

The workaround for using typer-cli is to use pip to install it and ignore the version conflicts.

We need to get this doc generation at least into our Makefile for manual triggering, but also hopefully build this into CI on PRs so we don't lose track again.