Fix "me" image on the about page

Add a section shortcode to enable wrapping a chunk of a post in a <section>
Add a section.flow class that removes grid from the section
Fix up the about styles so that the paragraph that Hugo wraps the <img> in behaves sensibly when floated
Fix the alt text in the circular_image shortcode

assets/styles/root/002_layout.css

@@ -260,6 +260,10 @@
     margin-inline-start: 0;
   }
 
+  section.flow {
+    display: block flow;
+  }
+
   ul, ol {
     list-style-position: inside;
   }