chore(tutorials): include video in custom elements tutorial

clientIO / joint

A proven SVG-based JavaScript diagramming library powering exceptional UIs

https://jointjs.com

Mozilla Public License 2.0

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Closed jamesgeorgewilliams closed 3 months ago

jamesgeorgewilliams commented 3 months ago

Sync custom-element tutorial with video inclusion.

Include youtube video in custom-element tutorial. This means this tutorial is in sync with JointJS_Site
Closes https://github.com/clientIO/joint/pull/2393