docs: 📝 Import / Export flow

apps/docs/docs/editor/export_import.md

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+# Export / Import a typebot
+
+A typebot flow can be exported to a JSON file using the menu button at the top right of the builder:
+
+<img
+  src="/img/export_flow.png"
+  width="400"
+  alt="Export flow button"
+/>
+
+Then this file can be imported when creating a new typebot by choosing "Import a file":
+
+<img
+  src="/img/import_flow.png"
+  alt="Import flow button"
+/>