docs(cli): add faucet to newdocs

[qbzzt]

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[alvrs]

we need to update the mud faucet CLI to use the new faucet service (#1893) - we could still merge this but put a warning on top (bc we're gonna shut down the test network mentioned here soon and don't have the old faucet service deployed to the new test network) or we wait with merging this until we have the new faucet CLI

[qbzzt]

This will be useless until we merge the new mud faucet command itself. I think this should turn into a "coming soon", with the real content commented out.