Links with `onClick` and `href` compete for event handling

Whenever <a href="#" onClick={handlerFunction}>Link</a> is used, for example here:

secondfront-donate-widget/src/components/Widget.tsx

Line 84 in edb5860

    
           <p>Thank you for supporting Ukrainians! <br />💙&nbsp;💛 <br /><a href="#" onClick={onDonationCancel}>Click here to make another contribution</a></p>

the proper way is to prevent default behaviour in the callback function with e.preventDefault(), otherwise page will navigate to #, which would probably result in jumping to the top of the page.

This issue applies to any <a> tag that uses href. Note, some answers suggest that <a href="#" onClick={() => handlerFunction()}>Link</a> doesn't suffer from this, but this solution behaves the same.

Addressed in #5