add sitemap_index.xml and add Wiki sitemap

[nschimme]

Summary by Sourcery

Enhancements:

• Adjust robots.txt contents to reference the updated sitemap location for the documentation site.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the sitemap URL reference in docs/public/robots.txt to point to the correct sitemap location.

File-Level Changes

Change	Details	Files
Adjust sitemap URL directive in robots.txt to the new sitemap location.	Modify the Sitemap directive to reference the updated sitemap URL Ensure robots.txt formatting and other directives remain unchanged	docs/public/robots.txt

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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