Bump react-dev-utils and @storybook/react in /docs

Removes [react-dev-utils](https://github.com/facebook/create-react-app/tree/HEAD/packages/react-dev-utils). It's no longer used after updating ancestor dependency [@storybook/react](https://github.com/storybookjs/storybook/tree/HEAD/code/renderers/react). These dependencies need to be updated together.


Removes `react-dev-utils`

Updates `@storybook/react` from 5.2.8 to 7.5.1
- [Release notes](https://github.com/storybookjs/storybook/releases)
- [Changelog](https://github.com/storybookjs/storybook/blob/next/CHANGELOG.v1-5.md)
- [Commits](https://github.com/storybookjs/storybook/commits/v7.5.1/code/renderers/react)

---
updated-dependencies:
- dependency-name: react-dev-utils
  dependency-type: indirect
- dependency-name: "@storybook/react"
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>