Trying to hyper-target our lurkers and incentivize sign-ups šŸš€ (and run a JS on login)

Adding this as a /head customization seems to work:

<script type="text/discourse-plugin" version="0.8">
        if (api.getCurrentUser()) {
        document.cookie = "logged_in=true; expires=Thu, 18 Dec 2017 12:00:00 UTC";
    }
</script>