fix(docs): update documentation name to "Lit Protocol Documentation"

[Ansonhkg]

WHAT

• Update meta data since these docs include security and governance. Not just the JS-SDK.

[Copilot]

Pull Request Overview

This PR updates the documentation title from "Lit JS SDK Documentation" to "Lit Protocol Documentation" to better reflect the broader scope of the documentation, which now includes security and governance topics beyond just the JS SDK.

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