Fix index.html rendering issues - remove corrupted content and restore clean landing page

[Copilot]

Problem

The index.html file was corrupted with duplicate HTML content, causing rendering issues on the GitHub Pages site. The file contained two complete HTML documents merged together:

1. A clean landing page (lines 25-138)
2. A full Quarto-generated document (lines 139-2855) that was accidentally appended

This resulted in:

• Duplicate navigation elements and content interfering with the layout
• A massive 2,855-line file with conflicting styles and JavaScript
• Poor user experience with extra unwanted content below the intended landing page

Solution

Extracted the clean landing page HTML and removed all corrupted content:

• Removed malformed HTML at the beginning (lines 1-24)
• Preserved the clean landing page content (lines 25-138)
• Removed the entire extra Quarto document (lines 139-2855)
• Reduced file size by 96% (from 2,855 lines to 113 lines)

Result

The page now displays as intended:

• Clean, professional landing page layout
• Two properly working course buttons in the header
• Well-designed course cards with "Open Material →" buttons
• No duplicate or interfering content
• All links working correctly

Before vs After

Before: Corrupted page with duplicate content

After: Clean landing page

The fix ensures the landing page serves its intended purpose as a clean entry point to the course materials without any rendering issues or unwanted content.

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