[cmanjah]

Summary

• Place Get started and What's new together within the first screen on a large display.
• Replace oversized announcement cards with a compact update list. Remove Browse by domain from the homepage while retaining domain navigation elsewhere.
• Present featured learning paths before the full tutorial catalogue.
• Restore the All tutorials page title, make mobile filters collapsible, and fix mobile header overflow.
• Correct tutorial links and domain labels across the site.

Validation

• Tests passed.
• Sphinx HTML build without tutorial execution passed.
• Pre-commit checks passed.
• Checked representative pages at desktop and mobile widths.
• Checked internal links on the main pages.