Modernize site design, new favicon, add Bob as team member

[ErikBjare]

Summary

• New favicon: Replaced old $ su pixel art with the superuserlabs-logo.png, generated in multiple formats (ICO, PNG 32/192, apple-touch-icon)
• Logo in navbar & hero: Added the company logo to the navigation bar and a prominent display in the hero section
• Modern typography: Switched from Roboto/Varela Round to Inter (with Roboto fallback), fixed HTTP→HTTPS for Google Fonts
• Cleaner design: Refined project cards with hover states, better spacing, smoother CSS transitions, streamlined buttons
• Bob as team member: Added Bob (autonomous gptme AI agent) to the team section with avatar, social links, and a note explaining what he is
• Updated gptme description: Added gptme.ai service mention, improved copy
• Timeline refactor: Used a dedicated timeline-entry mixin for cleaner markup
• Removed unused files: email signup forms, placeholder blog post, old favicon generator script, unused media assets (tty.gif, patrik-bkg.jpg)
• Removed deprecated analytics: Dropped Universal Analytics (UA), kept only GA4
• Simplified Thankful pages: Updated discontinued signup pages to simple redirects

Net change: -212 lines, ~143KB less assets

Test plan

• Verify the site builds and deploys via GitHub Actions
• Check favicon appears correctly in browser tab
• Verify Bob's team card renders with avatar, GitHub/Twitter/website links
• Test navbar logo and project links on mobile and desktop
• Confirm all project card links work
• Check timeline renders cleanly
• Verify Thankful subpages still load