Update the colors used in syntax highlighting to meet a11y standards (non-accessible colors shown crossed out). In order to have an accessible orange, with enough contrast to the red, the red also needs to change. The two groups with blue will use the same blue, instead of two different blues.
Mock with color information:
{F32357688}
**New hex values**
Black (body text) = #333333
Blue (heading, signatures, links, ...) = #014CDD
Purple = no change
Orange/brown (variables) = #B25E02
Red (parser functions) = #D91E18
Green (HTML, math, ...) = #008000
**Requirements**
[] Update colors for each of the different color groups
[] Remove background highlighting for nested elements
**Nice to have**
[] Make all text the same size (currently headings are shown larger)
[] Can we also fix this: {https://phabricator.wikimedia.org/T170042}?
**Relevant links**
[[ https://phabricator.wikimedia.org/diffusion/ECMI/browse/master/resources/mode/mediawiki/mediawiki.css | Current CSS ]]
[[ https://meta.wikimedia.org/wiki/Community_Tech/Wikitext_editor_syntax_highlighting#Color_and_style_customization | Overview of existing styling ]]