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

frontend/templates/base.html

@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<meta charset="utf-8">
+		<meta http-equiv="X-UA-Compatible" content="IE=edge">
+		<meta name="viewport" content="width=device-width, initial-scale=1">
+		<meta name="description" content="Merging Citavi projects and mapping existing datasets.">
+		<title>{% block title %}Citavi Mapper :: {{ title }}{% endblock %}</title>
+	</head>
+	<body>
+		<h1>{{ headline }}</h1>
+		<div id="content">
+			{% block content %}{{ content }}{% endblock %}t
+		<div>
+	</body>
+</html>