giscus: Use specific search term instead of og:title

This makes us more flexible and gives us ways to avoid title collisions (e.g. when the title on an extra post is a substring of some post title).

blog/templates/status-update-page.html

@@ -3,7 +3,6 @@
 {% 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>
@@ -33,7 +32,7 @@
     <hr>
     <section>
         <h2 id="comments">Comments</h2>
-        {{ snippets::giscus() }}
+        {{ snippets::giscus(search_term=page.title) }}
     </section>
 
 {% endblock after_main %}