build: update README to indicate that source has moved

[parthea]

Towards googleapis/google-cloud-python#14911

[gemini-code-assist]

Summary of Changes

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This pull request updates the README.rst file to inform users about the archival of this repository and the migration of its contents to a new, centralized location. This change ensures that anyone visiting the repository is immediately aware of its current status and where to find the active source.

Highlights

• Repository Status Update: Added a prominent note to the README.rst file indicating that the repository has been archived and its contents have moved to a new location within the google-cloud-python repository.

Changelog

• README.rst
  • Added a note at the top of the file about the repository being archived and its contents moved.
  • Included a reStructuredText reference for the new repository location.

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[chalmerlowe]

LGTM

[gemini-code-assist]

Code Review

This pull request adds a note to the README.rst file to indicate that the repository has been archived and its contents have moved. My review includes a suggestion to use a standard reStructuredText warning admonition for this note, which improves semantic correctness and rendering. This is a minor formatting suggestion for better documentation quality.

[gemini-code-assist]

For better semantic structure and rendering, it's recommended to use a standard reStructuredText admonition like .. warning:: to indicate the archived status of the repository. This is more standard than the current formatting and will be rendered more appropriately by tools that process RST. I've also capitalized 'GitHub' for consistency, made the entire notice bold for emphasis, and added a period at the end of the sentence.

Suggested change

	:**NOTE**: **This github repository is archived. The repository contents and history have moved to** `google-cloud-python`_.
	.. _google-cloud-python: https://github.com/googleapis/google-cloud-python/tree/main/packages/bigquery-magics
	.. warning::
	**This GitHub repository is archived. The repository contents and history have moved to `google-cloud-python`_.**
	.. _google-cloud-python: https://github.com/googleapis/google-cloud-python/tree/main/packages/bigquery-magics