Remove unused React imports

[felipecrs]

Closes #671

Testing done

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[timja]

This PR is close to done #666

so i'll hold off on merging linting PRs till then

[felipecrs]

@timja no problem. I can easily rebase it if needed, but this PR is done anyway in case you change your mind.

And it's the last lint-related PR I have in mind.

[felipecrs]

Ok, let's wait for #666, I don't want to delay it anyhow.

[felipecrs]

@timja this is ready to be reviewed again.