Add additional skiplink to bypass glossary nav

The normal skiplink skips the top level navigation, but the glossary
page also has its own sidebar inside the main element.

This commit adds a "skip to glossary content" skiplink, so users can
skip this as well.

Author: MatMoore

templates/base/base.html

@@ -8,8 +8,10 @@
     <script>
       document.body.className += ' js-enabled' + ('noModule' in HTMLScriptElement.prototype ? ' govuk-frontend-supported' : '');
     </script>
+    {% block skiplinks %}
     <a href="#main-content" class="govuk-skip-link" data-module="govuk-skip-link">Skip to main content</a>
-
+    {% endblock %}
+    
     {% include "base/navigation.html" %}
 
     <div class="govuk-width-container app-width-container">

templates/glossary.html

@@ -2,6 +2,11 @@
 {% load markdown %}
 {% load static %}
 
+{% block skiplinks %}
+{{block.super}}
+<a href="#glossary-content" class="govuk-skip-link" data-module="govuk-skip-link">Skip to glossary content</a>
+{% endblock %}
+
 {% block content %}
     <div class="govuk-grid-row">
         <div class="govuk-grid-column-one-quarter">
@@ -32,7 +37,7 @@ <h1 class="govuk-heading-l">Glossary</h1>
                 {%endfor%}
             </ul>
         </div>
-        <div class="govuk-grid-column-three-quarters">
+        <div class="govuk-grid-column-three-quarters" id="glossary-content">
             {% for parent_term in results %}
                 <div class="term-group">
                     <h2 class="govuk-heading-l" id="{{ parent_term }}">{{ parent_term.name }}</h2>