Add page views metric documentation

[mintlify]

Summary

• Documents the new page views metric on the analytics page
• Updates traffic source filtering description to include page views for both AI and human traffic
• Adds new Page views section explaining the chart and top pages table

Related: mintlify/mint#6376

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Note

Low Risk
Documentation-only update adding the new page views metric and adjusting described metric availability; no runtime or data-handling code changes.

Overview
Updates optimize/analytics.mdx to reflect the new page views metric in analytics.

Adjusts the traffic-source filtering description to include page views (and updated metric names) for human traffic, and adds a new Views section describing the page views chart and top-pages-by-views table.

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