Feature/stop using react fast refresh fork

[nicholasio]

Related Issue/RFC: #323

Description of the Change

We do not need to use our react fast refresh webpack plugin fork since the changes we needed were merged in the upstream package.

Alternate Designs

Possible Drawbacks

Verification Process

• npm run dev
• Edit a post and add the block "Example (with Linaria)"
• Make changes to this block code and confirm the changes are hot reloaded in gutenberg.

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.
• I have added a changeset to my PR. See CONTRIBUTING document for instructions

[changeset-bot]

🦋 Changeset detected

Latest commit: 2176224

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
10up-toolkit	Patch

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[Antonio-Laguna]

LGTM!