feat: design + perf + tags etc.

src/_includes/partials/banner-old-post.liquid

@@ -1,10 +0,0 @@
-{% assign isOldPost = date | oldPost %}
-{% if isOldPost %}
-  {% capture css %}
-    {% render "../../assets/styles/components/banner-old-post.css" %}
-  {% endcapture %}
-  <style>{{ css }}</style>
-  <div class="banner__old-post">
-    <p>{% tablericon "clock-x" "Old post" %} This post is over 3 years old. I've probably changed my mind since it was written and it <em>could</em> be out of date.</p>
-  </div>
-{% endif %}