initial draft of docs

[KevinVandy]

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• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm run test:pr.

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• This change affects published code, and I have generated a changeset.
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npm i https://pkg.pr.new/TanStack/hotkeys/@tanstack/hotkeys@5

npm i https://pkg.pr.new/TanStack/hotkeys/@tanstack/hotkeys-devtools@5

npm i https://pkg.pr.new/TanStack/hotkeys/@tanstack/react-hotkeys@5

npm i https://pkg.pr.new/TanStack/hotkeys/@tanstack/react-hotkeys-devtools@5

commit: 5335ff7