Add feed link to news index page.

opentech/public/news/templates/news/news_index.html

 {% extends "base.html" %}
 {% load wagtailcore_tags wagtailimages_tags static markdown_tags bleach_tags %}
+{% block feedlinks %}<link rel="alternate" type="application/rss+xml" title="{{ page.title }}" href="{% url "news_feed" %}">{% endblock %}
 {% block body_class %}light-grey-bg{% endblock %}
 
 {% block content %}

opentech/templates/base.html

@@ -6,6 +6,7 @@
         <meta name="viewport" content="width=device-width, initial-scale=1" />
         <title>{% block title_prefix %}{% if request.site.site_name %}{{ request.site.site_name }} | {% endif %}{% endblock %}{% block title %}{% if page.seo_title %}{{ page.seo_title }}{% else %}{{ page.title }}{% endif %}{% endblock %}{% block title_suffix %}{{ TITLE_SUFFIX }}{% endblock %}</title>
         <meta name="description" content="{% if page.search_description %}{{ page.search_description }}{% else %}{{ page.listing_summary }}{% endif %}" />
+        {% block feedlinks %}{% endblock %}
 
         <!-- favicons -->
         {% comment %}