Update jetty readme

Author: shs96c

third_party/java/jetty/README.selenium

@@ -1,9 +1,10 @@
-Source control: git
-URL: https://github.com/krosenvold/selenium-jetty-repack.git
-Version: ff8f1ef0c1f83e16618ad142cf7e0328f6f2999a
+The jetty-repackaged.jar is generated by running:
 
-Local Modifications:
-Applied patch "pom.xml.patch" before building the packed jetty.
+  go repack-jetty
 
-Once the artifact is built, unpacked and commented out all listeners in the
-webdefault.xml
+You only need to execute this script if you're using
+CrazyFun for your build (or want the jars in your
+IDE of choice). When using Buck, the repack is done
+as part of the build
+
+