Take over bottom region template for title, wrapper of blocks

Yeah i think everything in content paragraphs would be a lot better than this jankiness.
Not a big use case for putting this in multiple places anyway.

agaric/templates/layout/region--content-bottom.html.twig

@@ -1,3 +1,29 @@
-{% extends "@octavia/layout/region--content-bottom.html.twig" %}
+{#
+/**
+ * @file
+ * Theme override to display a region.
+ *
+ * Available variables:
+ * - content: The content for this region, typically blocks.
+ * - attributes: HTML attributes for the region div.
+ * - region: The name of the region variable as defined in the theme's
+ *   .info.yml file.
+ *
+ * @see template_preprocess_region()
+ */
+#}
 
-{% set attributes = attributes.addClass(['titlebar', 'titlebar-bigborder', 'content']) %}
+{% if content %}
+  <section class="section related">
+    <div class="container">
+      <div class="titlebar titlebar-bigborder content">
+        <div class="titlebar_title">
+          <h3 class="subtitle is-4 is-mono">Just one more thing...</h3>
+        </div>
+      </div>
+      <div class="columns">
+        {{ content }}
+      </div>
+    </div>
+  </section>
+{% endif %}