fix: code block contrast is too high

[jenshor]

First of all, thanks for the great tool and I really like the redesign of docs.page.

Description

I noticed that the contrast of the code block is quite high for the light theme as the code block seems to be quite black-ish in contrast to the white-ish background.

When compared to the dark theme, the code block integrates better with the background as the background is black-ish and the code block is gray-ish.

Suggestion
Lightening the code block background for the light theme might make the docs more pleasing to the eye and easier to read.

Additional notes
As this issue is quite opinionated feel free to let me know what you think 😀

[Ehesp]

Ah interesting... I did actually do this on purpose, as a fairly well known company also has this type of contrast in their docs too for code blocks. I'll have to change the tokenization colours too if we go ahead here.