Rebuild website as Sakura-themed CV with GitHub-driven content and ambient audio

[Copilot]

This PR replaces the existing site with a full Sakura-themed CV experience centered on your GitHub profile, with iced-tea styling and integrated background music. The previous matrix/clicker/track-selector implementation is removed in favor of a single coherent portfolio flow.

• CV-first page redesign

  • Replaced static/index.html with a new card-based one-page layout (hero, CV snapshot, projects, music, footer).
  • Added explicit GitHub profile link and streamlined section structure for quick scanning.

• Sakura + iced-tea visual system

  • Rewrote static/css/style.css with a new palette, typography, responsive layout, blossom-style background treatment, and reusable UI primitives (card, chip, btn, repo-card).

• GitHub data as source of truth

  • Reworked static/js/main.js to fetch profile and repositories from GitHub API and render:
    • profile metadata (name, bio, followers, following, repos, location, updated date)
    • top recently updated non-fork repositories

• Background audio architecture change

  • Removed external audio-file dependency and implemented browser-generated ambient playback via Web Audio API (play/pause stateful control).

• Feature cleanup

  • Removed legacy JS modules no longer aligned with the new direction:
    • static/js/matrix.js
    • static/js/lofi.js
    • static/js/cookieclicker.js
  • Updated README.md to match the new product shape and customization points.

const response = await fetch(`https://api.github.com/users/${username}`);
const profile = await response.json();
el.name.textContent = profile.name || profile.login || username;