docs(guides): add capability map and observability context to Applying Policies (#1997)

[Pittu-Sharma]

Related issue

Resolves #1997

Proposed Changes

This PR enhances the "Applying Policies" guide by adding a structured mapping of Kyverno's core capabilities to their respective outcomes.

Key updates include:

• Added a Capability-to-Outcome table under the "In Clusters" section, covering: Validate, Mutate, Generate, Verify Images, and Cleanup.
• Integrated contextual information for observability, explicitly linking to PolicyReports and the Policy Reporter tool.
• Refactored the section narrative to be more cohesive and professionally presented.
• Performed a deep verification to ensure all internal links use absolute paths and the content adheres to the project's documentation standards.
• Removed dead code and unwanted comments to ensure a clean, production-ready state.

Checklist

• I have read the contributing guidelines.
• I have inspected the website preview for accuracy.
• I have signed off my issue.

[Pittu-Sharma]

Hi ,

I have completed the updates for Issue #1997 regarding the 'Applying Policies' guide.

I've added the requested capability-to-outcome mapping table and integrated the observability context with links to PolicyReports and Policy Reporter. I also performed a deep cleanup of the file and verified that all internal links follow the project's absolute path standards.

I've successfully run the local build and link validation checks, and the DCO sign-off is included in the commit. The PR is now ready for your review.

Thank you!