Bump node-fetch and react-live in /docs (#62)

Removes [node-fetch](https://github.com/node-fetch/node-fetch). It's no longer used after updating ancestor dependency [react-live](https://github.com/philpl/react-live). These dependencies need to be updated together.


Removes `node-fetch`

Updates `react-live` from 2.2.2 to 2.4.1
- [Release notes](https://github.com/philpl/react-live/releases)
- [Commits](FormidableLabs/react-live@v2.2.2...v2.4.1)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: indirect
- dependency-name: react-live
  dependency-type: indirect
...

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