Losslessly compress PNG files.
Include forkme_right_darkblue_121621.png in the repo to reduce DNS lookup.
html files: Tidy up whitespace.

Use tabs consistently and remove trailing spaces.
Re-generate package.json and add missing properties.
Remove trailing spaces.
Move inline style to docs.css.

Also remove border: 0 since it's inherited from img.
Specify the image dimensions.