Update README with clearer and/or suggested AIWB configuration inputs

[nv-edwli]

I had a user trying to start the project who got confused at what to put for those configuration interstitials for the docker socket and for the local NIM cache.

The README does a good job providing a sample input for the latter:

but less so for the former:

I get that there is /var/run specified in the text, but unfortunately not everyone will read all of the text when working through the project.

Another concern is the user OS may require different formatting for these configurations. Maybe a good idea to call these out as well for clarity. For reference, the Hybrid RAG project states the following for a similar flow: