README diagram hard to read on GitHub's dark mode

[knpwrs]

See screenshot:

[balazsbotond]

Thank for reporting this.

Looks like GitHub supports displaying a different image on dark mode: https://www.stefanjudis.com/notes/how-to-define-dark-light-mode-images-in-github-markdown/

The SVG is in the docs/ folder, we could make a version with white text instead of black.

[balazsbotond]

Fixed.