Changes made for this site
Original: https://github.com/ctbot000/mahjong-game @ 5b29b66c87dd0e9bbdbc5754dd4fa152a4e50f9f
Author: CTBot000 (MIT license, see LICENSE)

- Copied only the runtime files (index.html, favicon.svg, css/style.css, js/*.js) plus LICENSE.
  The tests, package.json, README and GitHub workflow were left out.
- js/layouts.js: the Turtle board's description (and a code comment) no longer name a
  commercial game; it now reads "The traditional board: ...".
- index.html: the "Source on GitHub" footer link now opens in a new tab (rel="noopener").
No game logic was changed. All tile art is drawn as SVG by js/tiles.js; sounds are
synthesized with Web Audio by js/audio.js (no image or audio files).