puts more context/detail around totals/failed

xmrnodes/app.py

@@ -49,6 +49,8 @@ def index():
     return render_template(
         "index.html",
         nodes=nodes,
+        nodes_healthy=[n for n in nodes if n.available],
+        nodes_unhealthy=[n for n in nodes if not n.available],
         form=form
     )
 

xmrnodes/templates/index.html

@@ -40,6 +40,8 @@
     <br>
     {% if nodes %}
     <div class="xmrnodes">
+      <p class="center">Currently tracking {{ nodes | length }} nodes in the database. Of those, {{ nodes_unhealthy | length }} nodes failed their last check-in.</p>
+      <br>
       <table class="pure-table pure-table-horizontal pure-table-striped">
         <thead>
           <tr>