add Zendesk Chat Tag

[Findus23]

Works in my quick test and is pretty straight forward.

Unfortunately there is no nice way to copy the ID.

The widget looks like this:

<!--Start of Zendesk Chat Script-->
<script type="text/javascript">
    window.$zopim||(function(d,s){var z=$zopim=function(c){z._.push(c)},$=z.s=
        d.createElement(s),e=d.getElementsByTagName(s)[0];z.set=function(o){z.set.
    _.push(o)};z._=[];z.set._=[];$.async=!0;$.setAttribute("charset","utf-8");
        $.src="https://v2.zopim.com/?5vsZG8Jx0J9FS85qxc6Xn5MMIfVBDzML";z.t=+new Date;$.
            type="text/javascript";e.parentNode.insertBefore($,e)})(document,"script");
</script>
<!--End of Zendesk Chat Script-->

I tried to de-minimize it a bit to make it more readable.

[tsteur]

Works 👍 will merge next time with the other tags so don't have to fix the tests after merging too often.

[tsteur]

actually, maybe we could add a check to execute it only if a zendeskChatId exists: if (! zendeskChatId) {return;}

[Findus23]

While a check never hurts, I can't think of a way it could be undefined if it is required.