[TASK] Add private_settings.py, move some settings there.

public/templates/main.html

@@ -1,11 +0,0 @@
-<!DOCTYPE html>
-<html>
-	<head>
-		<meta charset="utf-8" />
-		<title>{% block title %}Citavi Mapper{% endblock %}</title>
-	</head>
-	<body>
-		<h1>{% block headline %}{% endblock %}</h1>
-		{% block content %}{% endblock %}
-	</body>
-</html>