A11y: add functionality for prefers-reduced-motion to the timeline #876
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This PR is related to issue #861 and #860. Users can enable
prefer-reduced-motion
in their respective operation system(macOS or windows) and TimelineJS should pick up those changes and change the duration of theslider
/timenav
when navigating the timeline.prefer-reduced-motion
checker on the timeline story slider prev, next button and change eventprefer-reduced-motion
checker on thetimenav
timeline ticker press and change event