[Docs]: Feature comparison link is broken

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Affected area/feature

This repository's README.md contains the following line:

See our [full feature comparison](https://smallstep.com/step-ca-vs-smallstep-certificate-manager/) for more.

The destination does not exist, though. It just redirects back to the home page: https://smallstep.com/.

I have so far been unable to locate a feature comparison on the website. The only relevant page I could find is this FAQ, which doesn't contain anything resembling a "full feature comparison."

I'd like to see the link updated to a current feature comparison document rather than just removed.