Changed the svg illustrations to use an explicitly white background.
This was done since a transparent background with the dark arrows was not accessible for users with dark-mode like settings in their browser.
Checklist
(I've crossed out non-relevant ones)
[X] My contributions and commit messages follows the style guidelines of this project
~[ ] I have made corresponding changes to the documentation~
~[ ] New and existing unit tests pass locally with my changes~
[X] The Pull Request has an informative and human-readable title
[X] Changes are limited to a single goal (avoid scope creep)
[X] Code can be automatically merged (no conflicts)
~[ ] I confirm that I have read any Contribution guidelines (CONTRIBUTING)~
[X] I confirm that I wrote and/or have the right to submit the contents of my PR, by agreeing to the Developer Certificate of Origin, by adding a 'sign-off' to my commits
Description
Changed the svg illustrations to use an explicitly white background.
This was done since a transparent background with the dark arrows was not accessible for users with dark-mode like settings in their browser.
Checklist
(I've crossed out non-relevant ones)