API Docs font and color suggestions

[levbishop]

Feedback

For example https://docs.quantum.ibm.com/api/qiskit/qiskit.primitives.StatevectorSampler

Problems making this hard to read:

1. So much white space, such tiny text
2. Serif font
3. Low contrast darkish gray on slightly less darkish gray (especially for comments)
4. proportional font for code(!)

Compare to eg tensorflow (which isn't anything special just the first thing came to mind)

1. Less white space, larger text
2. Sans serif
3. High contrast. Comments are magenta on light gray
4. Monospace code

Other comments

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