Fix missing anchors and 404 errors.

[skip sauce]

docs/_layouts/docs.html

@@ -25,7 +25,7 @@
           {% include nav-docs.html %}
         </div>
         <div class="col-md-9 col-md-pull-3 bd-content">
-          <h1 class="bd-title">{{ page.title }}</h1>
+          <h1 class="bd-title" id="content">{{ page.title }}</h1>
           {{ content }}
         </div>
       </div>