docs(README.md): remove outdated CloudBees integration

The CloudBees URL doesn't seem to work any more. And the
`CloudBees-community/angular-js-clickstart` (now moved to `CloudBees-attic`)
relies on the patched `michaelneale/angular-seed`, which hasn't been updated for
~2.5 years and is more than 40 commits behind `angular/angular-seed`.

Author: gkalpak

README.md

@@ -278,15 +278,6 @@ tests when you push to GitHub.
 You will need to enable the integration between Travis and GitHub. See the Travis website for more
 instruction on how to do this.
 
-### CloudBees
-
-CloudBees have provided a CI/deployment setup:
-
-<a href="https://grandcentral.cloudbees.com/?CB_clickstart=https://raw.github.com/CloudBees-community/angular-js-clickstart/master/clickstart.json">
-<img src="https://d3ko533tu1ozfq.cloudfront.net/clickstart/deployInstantly.png"/></a>
-
-If you run this, you will get a cloned version of this repo to start working on in a private git repo,
-along with a CI service (in Jenkins) hosted that will run unit and end to end tests in both Firefox and Chrome.
 
 
 ## Contact