feat: add js to check height and decide if to top is required

[Jh123x]

Set scroll to top element to available when page height -150 > browser height. -150 is based on testing

Closes #772

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[jpanther]

I'm not against making this a JS feature as frankly the current implementation using only CSS is a bit hacky, but I still think it should honour the .Site.Params.footer.showScrollToTop parameter.

[Jh123x]

I'm not against making this a JS feature as frankly the current implementation using only CSS is a bit hacky, but I still think it should honour the .Site.Params.footer.showScrollToTop parameter.

Hmm, let me try it in another way

[Jh123x]

It should also obey the rule in the config now