Usage & Examples
<script type="text/javascript" src="https://stnr.icu/surl.js"></script>
<input type="button" value="Short URL" onclick="prompt_curr_surl();"/>
<div id='curr_page_qr'></div><script>auto_short_qr();</script>
<div id='curr_page_short_url'></div><script>auto_short_url();</script>