Merge pull request #276 from statelyai/matt/added-changeset-for-og-image-changes

Added changeset for OG image changes

Author: mattpocock

.changeset/selfish-maps-drive.md

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+---
+'xstate-viz-app': minor
+---
+
+pr: #198
+
+Added generated OG images to visualized machine links. You can copy these links yourself to embed an up-to-date image of your visualized machine - for instance in docs. Here's where the share button is in the viz:
+
+![Share button on Stately Viz](https://user-images.githubusercontent.com/28293365/134316316-70f2cd1d-aa05-409c-b058-4a46fc8af1b5.png)