Improve game overview

- add counts for each section
- add average hours per session

games/templates/index.html

@@ -5,7 +5,7 @@
 {% block content %}
     <div class="text-slate-300 mx-auto max-w-screen-lg text-center">
         {% if session_count > 0 %}
-            You have played a total of {{ session_count }} sessions for a total of {{ total_duration }}.
+            You have played a total of {{ session_count }} sessions for a total of {{ total_duration_formatted }}.
         {% elif not game_available or not platform_available %}
             There are no games in the database. Start by clicking "New Game" and "New Platform".
         {% elif not purchase_available %}
@@ -14,4 +14,4 @@
             You haven't played any games yet. Click "New Session" to add one now.
         {% endif %}
     </div>
-{% endblock content %}
+{% endblock content %}