docs: list/import/get: document --config/--remote/--remote-config

[efiop]

Fixes #4712

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[dberenbaum]

From https://discord.com/channels/485586884165107732/1135946899011162203/1136125484019748995:

I wonder if the DVC (draft) documentation will address the different config files: config, config.local and custom config for remote registries in detail somewhere? Also worth having a description of how the local custom config gets merged with the registry's config.

[efiop]

From https://discord.com/channels/485586884165107732/1135946899011162203/1136125484019748995:

I wonder if the DVC (draft) documentation will address the different config files: config, config.local and custom config for remote registries in detail somewhere? Also worth having a description of how the local custom config gets merged with the registry's config.

The guy wanted only --remote, so I just added an example. Doesn't seem to be a reason to go too deep into config in this PR, maybe later on.

[efiop]

Let's run with this and I'll do any adjustments on top. This is useful as is, so eager to put it out there. Thanks again for the review!