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Remove preview wording and TODOs from README (#3374)

Summary:
Refining the README.md to not include preview wording now that we are at alpha and also no TODO in the directory structure.

Pull Request resolved: https://github.com/pytorch/executorch/pull/3374

Reviewed By: dbort

Differential Revision: D56646127

Pulled By: orionr

fbshipit-source-id: 49516e545bc5292d8fbf17060660a88f68c52c6e
O
Orion Reblitz-Richardson committed
f3c5695c2d3faeb86b2a51b1591f6c248e7f9275
Parent: f9b2415
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 4/26/2024, 8:11:27 PM