Adds sponsorship page

pinaxcon/templates/symposion/base.html

@@ -0,0 +1 @@
+{% extends "page_with_title_and_lede.html" %}

pinaxcon/templates/symposion/sponsorship/list.html

@@ -0,0 +1,8 @@
+{% extends "symposion/sponsorship/list_.html" %}
+
+{% block lede %}
+  We're grateful to the following organizations, who've made a substantial
+  contribution to North Bay Python 2017. If you want to join us, find
+  out more at our <a href="/sponsors/become-a-sponsor">become a sponsor
+  page</a>.
+{% endblock %}