Add "About Page"

[ewalid]

Summary

• Add comprehensive About page with "Why Rosetta Exists" section featuring a bento grid layout
• Add profile header with photo, contact links (LinkedIn, GitHub, Email), and "Open to AI opportunities" badge
• Add career timeline with 7 entries from Bioinformatics Research to AI Builder
• Add scientific publications section with 2 peer-reviewed papers
• Update favicon to use Languages icon matching the header logo

Test plan

• Verify About page loads at /about
• Check "Why Rosetta Exists" section displays 3 cards (Problem, Result, Built for AI) in a row on desktop
• Verify feature cards (Structure Preserved, API-First, Any Language) display below
• Confirm profile photo loads correctly at /walid.jpeg
• Test contact links open in new tabs (LinkedIn, GitHub) or trigger email client (Email)
• Verify timeline cards display in responsive grid layout
• Check publications link to correct external URLs
• Test dark mode styling on all components
• Verify responsive behavior on mobile (cards stack vertically)
• Confirm favicon displays updated Languages icon