feat(examples): change markdown editor on all examples

[alicanerdurmaz]

Due to deprecation of react-mde, we switched to react-md-editor on all examples.

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• [x] Corresponding issues are created/updated or not needed
• [x] Docs are updated/provided or not needed
• [x] Examples are updated/provided or not needed
• [x] TypeScript definitions are updated/provided or not needed
• [x] Tests are updated/provided or not needed
• [x] Changesets are provided or not needed

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