build: update README to indicate that source has moved and delete all files

[parthea]

Towards googleapis/google-cloud-python#10916

[gemini-code-assist]

Summary of Changes

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This pull request formally archives the python-ndb repository by deleting almost all its contents. The change consolidates the google-cloud-ndb package into the google-cloud-python monorepo, with the README.md updated to guide users to the new development location.

Highlights

• Repository Archival: This pull request marks the archival of the python-ndb repository, signifying its migration to a new, centralized location.
• Extensive File Deletion: Nearly all source code, documentation, configuration files, and supporting assets have been removed from this repository.
• README Update: The README.md file has been updated to inform users about the repository's archival and redirect them to the new source location within the google-cloud-python monorepo.

Changelog

• README.md
  • Updated to announce the repository's archival and redirect users to the new location of the google-cloud-ndb package within the google-cloud-python monorepo.

Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/unittest.yml

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[gemini-code-assist]

Code Review

This pull request archives the repository by deleting all files and adding a note to the README.md to indicate that the source code has moved. My review includes a suggestion to update the note in the README to use standard Markdown syntax for correct rendering.

[gemini-code-assist]

The syntax used for the note appears to be reStructuredText, but this is a Markdown file. This may cause rendering issues on GitHub. I suggest using Markdown syntax for the link to ensure it displays correctly.

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/google-cloud-ndb
	**NOTE**: This repository is archived. The repository contents and history have moved to [`google-cloud-python`](https://github.com/googleapis/google-cloud-python/tree/main/packages/google-cloud-ndb).