feat: add local admin authentication

app/web/templates/dashboard.html

@@ -0,0 +1,12 @@
+{% extends "base.html" %}
+
+{% block title %}Dashboard - MyWhoosh Garmin Sync{% endblock %}
+
+{% block content %}
+<h1>Dashboard</h1>
+<ul>
+    {% for user in users %}
+    <li>{{ user }}</li>
+    {% endfor %}
+</ul>
+{% endblock %}