Spike: Support widget in the support site

[dallasread]

Load up a support widget on an empty page in dev mode with hot-reloading, etc:

yarn support-widget

You can add the support widget on any website (with a permitted csp policy):

const $div = document.createElement('div')
$div.id = 'support-widget'
document.body.appendChild($div);

const $script = document.createElement('script');
$script.type = 'text/javascript';
$script.src = `https://deploy-preview-1330--dnsimple-support.netlify.app/support/widget.umd.js`;

document.getElementsByTagName('head')[0].appendChild($script);

We should run prettier on this if we go ahead.