chore: Fix feature branch cleanup workflow

[alimpens]

Describe the pull request

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What

It fixes an error in our feature branch cleanup workflow. The workflow tried to access an .nvmrc file that doesn't exist in the gh-pages branch.

Why

Because our workflow was broken.

How

It checks out the feature branch first, which does have the .nvmrc file. It uses it, and then checks out the gh-pages branch.

Checklist

Before submitting your pull request, please ensure you have done the following. Check each checkmark if you have done so or if it wasn't necessary:

• Add or update unit tests
• Add or update documentation
• Add or update stories
• Add or update exports in index.* files
• Start the PR title with a Conventional Commit prefix, as explained here.

[RubenSibon]

Can't really judge, but if it has been tested it's good to go!