Implemented dynamic generation of newsletter.

Takes the contents of the latest event and renders mailchimp-friendly html on /newsletter_content/ that can be inserted in a code block into mailchimp easily

_includes/header.html

@@ -21,7 +21,7 @@
 
     <!-- Pages -->
     {% for page in site.pages %}
-     {% if page.title %}
+     {% if page.title and page.visible == true %}
       <a class="header-btn navbar-text right button menu-icon hvr-sweep-to-top" href="{{ page.url | prepend: site.baseurl }}">{{ page.title }}</a>
      {% endif %}
     {% endfor %}
@@ -43,7 +43,7 @@
     <!-- Pages -->
     {% assign sorted_pages = (site.pages | sort: 'order') %}
     {% for page in sorted_pages %}
-     {% if page.title %}
+     {% if page.title and page.visible == true %}
       <a class="menu-icon-big navbar-text right button hvr-sweep-to-top" href="{{ page.url | prepend: site.baseurl }}"><i class="fa fa-{{ page.icon}}"></i></a>
      {% endif %}
     {% endfor %}
@@ -96,7 +96,7 @@
    <div class="row">
     <div class="col-md-7">
      <h4><i class="fa fa-newspaper-o"></i> Join our newsletter</h4>
-     {% include newsletter.html %}
+     {% include join_newsletter.html %}
     </div>
     <div class="col-md-5">
      <h4><i class="fa fa-share-alt"></i> Spread the word</h4>