Move into partials

source/_partials/post/old-post-message.html.twig

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+{% if page.date|date('U') < 'now'|date_modify('-12 months')|date('U') %}
+    <div class="border-2 border-blue p-4 mb-4">
+        <p class="mb-0">
+            <span class="font-bold">Warning:</span>
+            This post is over a year old. I don't always update old posts with new information, so some of this information may be out of date.
+        </p>
+    </div>
+{% endif %}

source/_partials/post/questions-comments.html.twig

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+<div class="mb-4 italic text-grey-dark">
+    <p>Questions? Comments? I’m <a href="https://twitter.com/{{ site.twitter.name }}" class="link">@{{ site.twitter.name }}</a> on Twitter.</p>
+</div>