First fully working user management, move to layout groups

src/routes/(main)/login/+page.svelte

@@ -0,0 +1,13 @@
+<h1>Log In</h1>
+<form action="?/login" method=POST>
+	<label>
+		Username
+		<input type="text" name="username">
+	</label>
+	<label>
+		Passwort
+		<input  name="password" type="password">
+	</label>
+
+	<button type="submit">Log In</button>
+</form>