Ignore motion effect if reduce motion is turned on

[BasThomas]

If a user turns on reduce motion, we should ignore the motion effects.

If we want to keep the consumer of the library in charge, we should add a recommendation in the header docs and in the example code.

We can also choose to ignore motion on the library level - in which case we should update the header docs to reflect it.

[rnystrom]

I say we make the lib handle this and promote best practices.

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