enhancement: Scroll instantly when the user prefers reduced motion

[LeopoldTal]

Summary

The prefers-reduced-motion media query allows users to specify an accessibility setting for less animation.

Smooth scrolling can trigger seasickness for some users, so if the user has set this preference, scroll instantly.

No behaviour change when this preference is not set.

What kind of change does this PR introduce?

Feature

For any code change,

• [ ] Related documentation has been updated if needed
• [ ] Related tests have been updated or tests have been added

Couldn't find any applicable doc or tests, let me know if I missed any.

Does this PR introduce a breaking change? (check one)

• [ ] Yes
• [x] No

If yes, please describe the impact and migration path for existing applications:

Related issue, if any:

Tested in the following browsers:

• [ ] Chrome
• [x] Firefox
• [x] Safari
• [ ] Edge
• [ ] IE

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