docs(tvix/boot): update README more r/8430

The environment variables caused both nar-bridge and tvix-store daemon
to try to connect to the same store, which fails due to locking issues.

Pass the config to `tvix-store daemon` directly. Also, add the
`--otlp=false` to the instructions to remove spam, most users don't have
a OTLP collector running.

Explain when to use gRPC in `tvix-store virtiofs` and when not.

Also, point out to be able to boot a NixOS closure, it needs to be
copied into the store first.

Change-Id: If4eda07bba28ad0bbe70e468cb727441a21b0588
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12067
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com>

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