chore(docs): cleanup basic example and expand comments

docs/examples/basic/initial-elements.js

@@ -1,15 +1,14 @@
 import { MarkerType } from '@vue-flow/core'
 
-/**
- * You can pass elements together as a v-model value
- * or split them up into nodes and edges and pass them to the `nodes` and `edges` props of Vue Flow (or useVueFlow composable)
- */
-export const initialElements = [
+export const initialNodes = [
   { id: '1', type: 'input', label: 'Node 1', position: { x: 250, y: 0 }, class: 'light' },
   { id: '2', type: 'output', label: 'Node 2', position: { x: 100, y: 100 }, class: 'light' },
   { id: '3', label: 'Node 3', position: { x: 400, y: 100 }, class: 'light' },
   { id: '4', label: 'Node 4', position: { x: 150, y: 200 }, class: 'light' },
   { id: '5', type: 'output', label: 'Node 5', position: { x: 300, y: 300 }, class: 'light' },
+]
+
+export const initialEdges = [
   { id: 'e1-2', source: '1', target: '2', animated: true },
   { id: 'e1-3', label: 'edge with arrowhead', source: '1', target: '3', markerEnd: MarkerType.ArrowClosed },
   {