minor layout and grammar changes

src/_includes/layout/base.njk

@@ -23,7 +23,7 @@
         <header>{% include 'partials/header.njk' %}</header>
         <hr/>
         <article>
-            <h1>{{ title }}</h1>
+            <h2>{{ title }}</h2>
             {{ content | safe }}
         </article>
       </div>