UI fixes

Fix hamburger menu position. Fixes #12
Smaller headings. Fixes #13

theme/sass/style.scss

@@ -228,6 +228,10 @@ nav.subnav li {
     margin: 0 auto;
   }
 
+  h2 {
+    font-size: 2rem;
+  }
+
   h2#title {
     margin: 0px;
   }
@@ -308,6 +312,10 @@ nav.subnav li {
   article ol li {list-style-position: inside}
 
   @media #{$small-and-down} {
+    .container.nav-wrapper {
+      width: 100%;
+    }
+
     #content {
       width: 100%;
     }
@@ -317,14 +325,14 @@ nav.subnav li {
       min-width: 100%;
     }
   }
-  
+
   .video-container {
     max-width: $p-max-width;
     margin: 0 auto;
     height: initial;
     padding: 0;
   }
-  
+
   .videodiv {
     width:100%;
     margin:0 auto;