To add a new board to the site:

1. Duplicate template.md to _board/<board id>.md.
2. Edit _board/<board id>.md according to the template's instructions.
3. Provide 3 images. An original high-quality image. A smaller image (300 px width), and a larger image (700 px width) in each respective directory (assets/images/boards/{small large original}) and process them in something like https://squoosh.app/ to reduce file size. If you only have one image, place it in the 'original' folder.
4. Create a pull request with the file changes.