Update colors for table of contents to be more in line with the theme

[hichemfantar]

Revise the custom theme colors to enhance the appearance of the table of contents and code elements.

before

after

before

after

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[cortinico]

LGTM 👍 @Simek what do you think?

[Simek]

I think that light mode indicator and entry appearance is less contrasty and harder to spot than before the changes.

If we decided that we want to change the sidebar entries, I would try to align them with react.dev design, which represent the most up-to-date patterns.

[hichemfantar]

I updated the colors for the light theme to have better contrast and included a contrast check report as well.
let me know what you think.

[Simek]

Thanks for the updates! IMHO it looks better after the last iteration, left two nits above.

[hichemfantar]

@Simek You're welcome! All requested changes have been implemented 🚀

[Simek]

Thank you for the updates, LGTM! 👍