Add products taxonomy to improve findability

[kenanlv]

Adds docs products taxonomy to the repo to improve findability experiences (onsite search, recommendations and others)

Product Label	Products
Xamarin	https://authoring-docs-microsoft.poolparty.biz/devrel/f0c462af-0ef9-4821-b36f-ba3d94736e2b

[opbld31]

Docs Build status updates of commit 4e107f5:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/Mono.Android/en/docfx.json	✅Succeeded

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel

[opbld31]

Docs Build status updates of commit 4e107f5:

❌ Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
	❌Error		Details

• [Error: PullRequestMergeConflict] Cannot sync git repo to specified state. Please make sure the pull request is mergeable.

For more details, please refer to the build report.

If you see build warnings/errors with permission issues, it might be due to single sign-on (SSO) enabled on Microsoft's GitHub organizations. Please follow instructions here to re-authorize your GitHub account to Docs Build.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

Note: Your PR may contain errors or warnings unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel

[pjcollins]

@kenanlv @davidbritch is this change still required for us?

[davidbritch]

Closing in favour of #43