Add accessible syntax highlighting themes

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Purpose

The existing syntax highlighting themes (other than "none") all seem to have at least one color combination that has low contrast.

GitLab syntax highlighting themes

Proposal

Add at least one light and one dark syntax highlighting theme that has sufficient color contrast. Each theme should have the same or greater level of language coverage as the existing themes.

Here are some candidates that both have light and dark support (language coverage would have to be tested):

a11y (https://github.com/ericwbailey/a11y-syntax-highlighting)

Light Dark
a11y light syntax highlighting example a11y dark syntax highlighting example

Light/Night Owl (https://github.com/sdras/night-owl-vscode-theme)

Light Dark
light owl syntax highlighting example night owl syntax highlighting example

Accessible pygments themes (https://github.com/Quansight-Labs/accessible-pygments)

Light Dark
accessible pygments theme light examples accessible pygments theme dark examples
Edited by 🤖 GitLab Bot 🤖