build: update README to indicate that source has moved

[ohmayr]

Towards googleapis/google-cloud-python#16054

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request aims to clearly communicate the archival of the current repository and the migration of its contents to a new location within the google-cloud-python project. This update ensures that users are immediately aware of the change in the source's location, directing them to the active development repository.

Highlights

• Repository Migration Notification: A prominent note has been added to the README.rst file, informing users that this GitHub repository is archived and its contents have been moved to the google-cloud-python monorepo, specifically under packages/sqlalchemy-spanner.

Changelog

• README.rst
  • Added a notification regarding the repository's archival and the new location of its source code.

Activity

• No specific activity has been recorded for this pull request beyond its creation.

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[gemini-code-assist]

Code Review

This pull request updates the README.rst file to indicate that the repository has been archived and its contents moved. My review suggests a small improvement to the formatting of the notice to make it more prominent and idiomatic for reStructuredText, using a warning admonition.

[gemini-code-assist]

For better visibility and to follow reStructuredText conventions, it's recommended to use a warning admonition for this important note. This will make the message more prominent to users visiting the repository. The current syntax uses a definition list which is less conventional for this purpose, and the double bolding is redundant.

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

[chalmerlowe]

LGTM