Chore: Remove selection styles in the doc

[troywith77]

What: Removes the selection styles on pre and code elements to approve readability.

Why: It's quite unreadable when selecting text on these elements,

How: By removing the ::selection selectors on these elements.

I'm encountering this issue when I'm reading the doc. If the design needs to be updated, I'd be happy to do it. Please feel free to close this PR if it's not necessary.

Checklist:

• Documentation
• Tests N/A
• Code complete
• Changeset N/A

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Latest commit: aff31c1

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[Andarist]

LGTM

[troywith77]

thanks @Andarist! Do you think we can get this merged?