GitHub dark-mode URI fragment is deprecated

[R055A]

It is no longer required to append #gh-dark-mode-only and #gh-light-mode-only to support rendering images in dark mode when using GitHub README.md markdown.

See here for more information: Specifying the theme an image is shown to #

It is now possible to add the prefers-color-scheme media feature to HTML in README.md markdown, but it is much better to implement it in the SVG generated files using CSS! The current deprecated implementation will require being refactored anyway.