Refine the homepage buttons + typo

- length reduced but no impact to performance
- placeholder 'edit' now goes to a 404

go/go/templates/link_box.html

@@ -40,7 +40,7 @@
       <br></br>
 
       <strong>
-        <a href="https://www.google.com">
+        <a href="error_404">
           Edit
         </a>
       </strong>

go/go/templates/public_landing.html

@@ -63,15 +63,16 @@ Go - Welcome
     </p>
 
   </div>
+</div>
 
-  <div class="col-md-6">
-    <br></br>
+<hr />
+<div class="row">
+  <div class="col-md-offset-1 col-md-4">
     <a href="{% url 'go_login' %}" class="btn btn-primary btn-block">Log In</a>
   </div>
 
-  <div class="col-md-6">
-    <br></br>
-    <a href="{% url 'signup' %}" class="btn btn-primary btn-block">Signup</a>
+  <div class="col-md-offset-2 col-md-4">
+    <a href="{% url 'signup' %}" class="btn btn-primary btn-block">Sign Up</a>
   </div>
 
 </div>