feat(Accordion): open when using search-in-page

[Barsnes]

POC for opening Accordion when the user uses search-in-page.

Uses hidden="until-found", which is not yet supported in Firefox. If you are in a browser that does not support the beforematch event, it starts opened.

Edits how AnimateHeight works.

References: https://developer.chrome.com/docs/css-ui/hidden-until-found https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/hidden#the_hidden_until_found_state