add about blurb, fix sidebar on mobile

themes/saturn/layouts/partials/sidebar.html

@@ -15,6 +15,9 @@
                         {{ end }}
                     </ul>
                 </div>
+                <p class="about">
+                    {{.Site.Params.about}}
+                </p>
             </div>
         </header>
         <nav>

themes/saturn/static/css/main.css

@@ -360,6 +360,10 @@ a.hover-links:hover {
         background-color: var(--content-bg);
     }
 
+    .main-sidebar {
+        width: 100%;
+    }
+
     main {
         padding: 0 45px;
     }