show up to h3 in blog toc

[carlosabadia]

No description provided.

[greptile-apps]

Greptile Summary

This PR limits the blog table of contents to display only h1, h2, and h3 headings by filtering out deeper heading levels. Additionally includes a responsive styling adjustment for the page gradient background.

• Filters TOC entries to heading levels 1-3 using list comprehension
• Updates CSS classes for improved responsive gradient behavior across screen sizes

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• Simple, focused changes with clear logic - TOC filter correctly limits heading levels, and CSS adjustments are standard responsive design patterns
• No files require special attention

Important Files Changed

Filename	Overview
pcweb/pages/blog/page.py	Added TOC filter to show only h1-h3 headings and adjusted responsive gradient styling

_{Last reviewed commit: 64965b3}

[greptile-apps]

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