Switch comments from utterances to giscus

to use GitHub discussions instead of issues for comment threads.

blog/templates/status-update-page.html

@@ -3,6 +3,7 @@
 {% import "snippets.html" as snippets %}
 
 {% block title %}{{ page.title }} | {{ config.title }}{% endblock title %}
+{% block head %}<meta property="og:title" content="{{ page.title }}" />{% endblock head %}
 
 {% block main %}
     <h1>{{ page.title }}</h1>
@@ -32,7 +33,7 @@
     <hr>
     <section>
         <h2 id="comments">Comments</h2>
-        {{ snippets::utterances() }}
+        {{ snippets::giscus() }}
     </section>
 
 {% endblock after_main %}