Add tabIndex attribute to scroll to top btn

[BSlaven]

Closes #990

Simply adding tabIndex attribute to the button did not work in the sense that pressing Enter did not trigger the function.

My solution was to add onKeyPress attribute to the button and pass it the same function as for onClick.

This of course meant that I had to make sure that only pressing 'Enter' and clicking on the button trigger that function.
Hence the condition.

[github-actions]

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[EmmaDawsonDev]

Ah yes, that makes sense! Thanks for spotting the need for a key press and adding it in. LGTM!

[digambar-t7]

Hey, can you remove line no 29 and check if it is significant

[BSlaven]

Actually line 29 is rather useless. With or without it functionality seems to work fine both on homepage and on profile page.
Also both by pressing enter or clicking on it.
Should I remove it? Thoughts?

[digambar-t7]

Being the creator of the scroll-to-top-btn, I think that line no.29 should be erased because I don't remember the grounds on which I included it.
But, let's have a confirmation from others.

[EmmaDawsonDev]

Yes, go ahead and remove it if it’s not serving any purpose

[BSlaven]

I removed the unnecessary line.