Add documentation for per-page feedback view

[mintlify-development]

Summary

• Added new section documenting the Feedback by page view in the analytics dashboard
• Explains how to access the view and what the Liked by viewers and Needs improvement lists show
• Helps users understand how to use aggregated thumbs feedback to identify high and low performing pages

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Note

Low Risk
Documentation-only change with no runtime or data-handling impact.

Overview
Adds a new Feedback by page section to optimize/feedback.mdx, documenting the per-page aggregated thumbs feedback view in the analytics dashboard.

Explains how to access the view and how the Liked by viewers and Needs improvement lists are derived and interpreted (including vote counts, sorting, and the feedback balance indicator).

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