Add a 'scroll to top' click event on click a FAQ menu

[elena-zh]

1. Open the FAQ page
2. scroll down to a section
3. press on the FAQ menu

AR: page's content is not auto-scrolled to the top https://watch.screencastify.com/v/eKrqzGrzIaxV0Ti7xxhv

ER: scroll page content to the top

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