Tweak header to look better on mobile

sass/_chrome.scss

@@ -14,6 +14,8 @@ header {
     h1 {
       margin: 0 0 0 auto;
       font-weight: 400;
+      font-size: 1.3rem;
+      text-align: right;
     }
   }
 }

templates/base.html

@@ -30,7 +30,7 @@
           <img class="header-logo-sm" src="{{ rel_top ~ 'assets/wwt-globe.png' | safe }}">
         </a>
 
-        <h1>WWT Documentation</h1>
+        <h1>The WWT Documentation Hub</h1>
       </div>
     </header>