Added blocktime generation

Also refactored the "base" template stuff - really should've done that in
a separate commit

templates/blockchain_time_results.html.tera

@@ -0,0 +1,13 @@
+{% extends "base" %}
+{% block content %}
+<h1>Big Tim Results</h1>
+    <div class="blockchain_infos">
+      {% for bts in blocktimes %}
+      <div class="blockchain_info">
+        <h2>{{bts[0]}}</h2>
+        <p>Height: <span class="result">{{bts[1]}}</span></p>
+      </div>
+      {% endfor %}
+    </div>
+    <p>I hope that was useful for you! <a href="/">Go home</a> to try again.
+{% endblock content %}