Invoice UI improvements. Renamed pages, added description, and added total number of events

RIGS/templates/RIGS/invoice_list_archive.html

@@ -0,0 +1,13 @@
+{% extends 'RIGS/invoice_list.html' %}
+
+{% block title %}
+Invoice Archive
+{% endblock %}
+
+{% block heading %}
+All Invoices
+{% endblock %}
+
+{% block description %}
+<p>This page displays all invoices: outstanding, paid, and void</p>
+{% endblock %}