Thinking In React example loads CodePen script multiple times

[danielsbird]

The Thinking in React doc has three embedded CodePens and each of them load the same script: one, two, three.

Loading CodePen's script once is enough to make all the pens on that page work.

[bvaughn]

Thanks for pointing this out. Looks like a great first-task for someone!

[ishankbahl]

Hey @bvaughn, made a pull request for this.