docs(examples): add edge markers example

[bcakmakoglu]

🚀 What's changed?

• Add edge markers example to docs
  • Demonstrates built-in, as well as custom markers

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Latest commit: 49716b0

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Name	Status	Preview	Comments	Updated (UTC)
vue-flow-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 8, 2024 8:28pm