Revert "Updated usage metrics instructions"

This reverts commit d17ebf8.

README.md

@@ -59,9 +59,3 @@ Send us PRs, we would love to see what you do! You can also check our GH issues
 ### Join Us
 
 WE'RE HIRING! Love Docker, Go and distributed systems? Learn more about [our open positions](https://jobs.lever.co/pachyderm/) or email us at jobs@pachyderm.io.
-
-## Usage Metrics
-
-Pachyderm automatically reports anonymized usage metrics. These metrics help us
-understand how people are using Pachyderm and make it better.  They can be
-disabled by setting the config: `pachctl config set metrics false`