add deployments task to ignition docs

[zoeyTM]

Documenting the deployments task for Hardhat Ignition.

Task: https://github.com/NomicFoundation/hardhat-ignition/issues/646 PR: https://github.com/NomicFoundation/hardhat-ignition/pull/647

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Latest commit: daec0bdf6258af5ae24151415f99913944d0e3c4

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Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 12, 2023 1:53am