First version of the site

## What changed

- `public/`: a single page for mpckit (intro, app screenshots, features, download and install notes per system, disclaimer). Styled after monoexp.com: the same stylesheet tokens, light and dark themes, with the app's amber as the only accent.
- `public/images/`: screenshots of the Pads and Sequences tabs from the Windows build. The local export path in the status bar was painted out.
- `public/favicon.svg`: the app icon (4x4 pad grid, pad 1 lit), redrawn as SVG.
- `nginx/mpckit.monoexp.com.conf`: the site file for the server.
- `LICENSE`: filled in the copyright line (2026 bajdev).
- `README.md`, `pull-releases/`: how to preview and deploy; this record.

## Notes

- No download links yet: builds come with the app's new repository. Until then the page says downloads will be listed there and points to the source.
- Source links point to git.monoexp.com/bajdev/mpckit until the app repository moves.

## Testing

- Served `public/` locally and checked desktop, mobile, light and dark screenshots.