moving the sticky apply button in to it's own template

opentech/templates/base.html

@@ -75,7 +75,10 @@
             <header class="header header--standard {% block header_modifier %}{% endblock %}">
         {% endif %}
 
-            <a href="#" class="link link--fixed-apply">Apply</a>
+            {% block apply_button %}
+                {% include "includes/apply_button.html" %}
+            {% endblock %}
+
             <div class="header__inner wrapper wrapper--large">
                 <a href="{% slugurl 'home' %}" aria-label="Home link">
                     <svg class="header__logo header__logo--desktop header__logo--desktop-light"><use xlink:href="#logo-desktop"></use></svg>

opentech/templates/includes/apply_button.html

+<a href="#" class="link link--fixed-apply">Apply</a>