docs for running locally

[conico974]

Add some docs on how to run OpenNext locally.
We could also include some of these override inside OpenNext directly, but i'm not sure it's worth it (if you need them, it's likely that you want to modify them as well)

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Latest commit: 28e2f31

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Name	Status	Preview	Comments	Updated (UTC)
open-next	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 8, 2024 0:25am