simplify override file regex

[yannbf]

Issue: N/A

What Changed

The regex from #40 was not supported, so I just simplified things as much as possible. Thanks @ndelangen !

Checklist

Check the ones applicable to your change:

• [x] Ran yarn update-all
• [ ] Tests are updated
• [ ] Documentation is updated

Change Type

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• [ ] maintenance
• [ ] documentation
• [x] patch
• [ ] minor
• [ ] major

[github-actions[bot]]

:rocket: PR was released in v0.3.5 :rocket: