feat: Extend options to pass custom nodes / edges

* Accept either a Record<string, Component | boolean> or string[] as nodetypes option
* If bool / string is used a slot will be expected, otherwise no node/edge will be rendered

Signed-off-by: Braks <78412429+bcakmakoglu@users.noreply.github.com>

examples/index.css

@@ -1,4 +1,4 @@
-@import "../dist/theme-default.css";
+@import "../src/theme-default.css";
 
 body {
   color: #111;