HUGE WebUI overhaul

- Removed ugly styles in header
- Properly implemented Bootstrap's NavBar
- Added username to session

titles/pokken/frontend/pokken_index.jinja

@@ -1,4 +1,4 @@
 {% extends "core/frontend/index.jinja" %}
 {% block content %}
-<h1>Pokken</h1>
+<h1>Pokkén</h1>
 {% endblock content %}