chore(website): add Help Scout Beacon widget code

Also in this commit:
* add Facebook domain ownership HTML code and TXT files for
  verification purposes

data/theme/main.html

@@ -10,4 +10,16 @@
   <br>
   <a href="https://github.com/recaptime-dev/website/issues">Let us know</a> about
   your experience with the site revamp in the issue tracker.
+{% endblock %}
+
+{% block extrahead %}
+<meta name="facebook-domain-verification" content="oqgo40ps95549wk05tl8vokf93guob" />
+<meta name="facebook-domain-verification" content="t64vrmua7c3w1l4ubyxg0f0s13vnne" />
+{% endblock %}
+
+{% block content %}
+  {{ super() }}
+  <!-- Help Scout Beacon widget -->
+  <script type="text/javascript">!function(e,t,n){function a(){var e=t.getElementsByTagName("script")[0],n=t.createElement("script");n.type="text/javascript",n.async=!0,n.src="https://beacon-v2.helpscout.net",e.parentNode.insertBefore(n,e)}if(e.Beacon=n=function(t,n,a){e.Beacon.readyQueue.push({method:t,options:n,data:a})},n.readyQueue=[],"complete"===t.readyState)return a();e.attachEvent?e.attachEvent("onload",a):e.addEventListener("load",a,!1)}(window,document,window.Beacon||function(){});</script>
+  <script type="text/javascript">window.Beacon('init', 'befb0a3b-6162-4ec4-889d-1bc5abc1558b')</script>
 {% endblock %}

src/oqgo40ps95549wk05tl8vokf93guob.html

@@ -0,0 +1 @@
+oqgo40ps95549wk05tl8vokf93guob

src/t64vrmua7c3w1l4ubyxg0f0s13vnne.html

@@ -0,0 +1 @@
+t64vrmua7c3w1l4ubyxg0f0s13vnne