Remove check to ensure .cache/json folder exists

[nickytonline]

Thanks for suggesting a new feature!

Please fill in the sections below.

This is not an enhancement, more of a code cleanup.

#124 ensured the .cache/json folder existed, but this appears to no longer be necessary based on the fix in gatsbyjs/gatsby#33431 (merged in October 2021) that resolved gatsbyjs/gatsby#33262.

Describe the solution you'd like

Revert #124 as this check is no longer necessary.

Describe alternatives you've considered

N/A

Can you submit a pull request?

Yes.

Pull requests are welcome! If you would like to help us add this feature, please
check our contributions guidelines.

[ascorbic]

Thanks, @nickytonline! We'll get this done in the next release