fix: rewrite GitHub Pages site to display properly with dynamic OSINT detective humor

[thumpersecure]

The site at thumpersecure.github.io/Spin was showing the README.md
rendered by Jekyll instead of the OSINT toolkit HTML. Root causes:

• No index.html at repo root (Pages served README as fallback)
• No .nojekyll file to prevent Jekyll processing

Changes:

• Add .nojekyll at root and docs/ to bypass Jekyll
• Add index.html, style.css, app.js at repo root so Pages serves them
• Completely rewrite all three files with cleaner, well-structured code
• Add animated loading screen with investigator boot sequence
• Add rotating OSINT detective jokes system (24 jokes)
• Add scrolling intel brief ticker with 20 OSINT tips
• Add periodic "Field Note" tip popups
• Add rotating header taglines and footer jokes
• Add case number generator and session ID
• Add classified stamp, scanline overlay, gradient animations
• Add investigation status panel with OPSEC level meter
• Preserve all existing OSINT tools (phone, email, username, domain,
  entity extractor, hivemind, bookmarks)
• Sync all files to docs/ folder as well