Remove RRE References in Documentation

[aehm03]

There are two occurences of port 7979:

katas/000_setting_up_chorus.md
158:Bring up http://localhost:7979 and you will see a relatively unexciting empty dashboard.  Don't worry, in our first kata, we'll do a relevancy test and fill this dashboard in.

README.md
53:> open http://localhost:4000 http://localhost:8983 http://localhost:9000 http://localhost:3000 http://localhost:7979

Which refer to RRE, which was removed.

[epugh]

Would you like to submit a PR for this? Thank you fro bringing it to our attention!