Improve site nav coloring/font schemes

[ang-zeyu]

Please confirm that you have searched existing issues in the repo

Yes, I have searched the existing issues

Any related issues?

No response

What is the area that this feature belongs to?

No response

Is your feature request related to a problem? Please describe.

This comes in 2 parts:

1. Super bold usage in docs - imo this is too bold
2. Default font design, etc.

I'm not much of a UX designer but the current site nav design still feels a little lacking. Could just be that I've been staring at it for too long. Feel free to input here.

Describe the solution you'd like

Remove the super bold usage and any other tweaks.

Describe alternatives you've considered

No response

Additional context

No response