Adding doc on the new Requests tab in the Console

[SharpRake]

Type of change

Documentation

This PR adds a new article documenting the Requests section of the Chainguard Console, which allows customers to submit and track requests for new Chainguard resources (container images, packages, and Helm charts). It also adjusts the sidebar weight of the Unique Tags article to accommodate the new page in the navigation order.

What should this PR do?

resolves https://github.com/chainguard-dev/internal/issues/5685

Why are we making this change?

The Chainguard Console recently launched a new Requests section (currently in beta) that gives customers a self-service way to request resources Chainguard doesn't yet offer. Without documentation, customers may not know this feature exists or understand how to use it effectively — including its prerequisites (verified organization membership), the request submission workflow, upvoting mechanics, and the limitations on what Chainguard can build.

What are the acceptance criteria?

• The new article renders correctly at its expected path under the chainguard-images/features/ section.
• The page accurately reflects the current state of the Requests section in the Console, including the three tabs (My requests, Active builds, Community requests), the required and optional form fields, and the status values.
• The beta disclaimer is clearly visible.
• The sidebar ordering is correct after the weight adjustment to unique-tags/index.md.
• All internal links (e.g., to verified orgs, Catalog Pricing) resolve correctly.

How should this PR be tested?

1. preview link
2. Cross-reference the article against the live Requests section of the Chainguard Console to verify accuracy of UI descriptions (tabs, columns, form fields, status values).
3. Click through to the article and verify it renders without errors.

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[matthewhelmke]

I left a couple of non-blocking comments. This looks great! Thank you!!

Approved.