Update wiki link to main Servo wiki

Closes #151.

README.md

@@ -5,16 +5,13 @@
 ## What's going on?
 
 Salt is a configuration management tool that we use to automate Servo's
-infrastructure. See [the
-tutorials](http://docs.saltstack.com/en/latest/topics/tutorials/) to get
-started.
+infrastructure. See [the tutorials](http://docs.saltstack.com/en/latest/topics/tutorials/) to get started.
 
 ## Contributing
 
-There are guides for some tasks available on [the
-wiki](https://github.com/servo/saltfs/wiki). If you see a way that these
-configurations could be improved, or try to set up your own instance and run
-into trouble, file [an issue](https://github.com/servo/saltfs/issues/new)!
+There are guides available on [the servo wiki](https://github.com/servo/servo/wiki/Buildbot-administration).
+If you see a way that these configurations could be improved, or try to set up
+your own instance and run into trouble, file [an issue](https://github.com/servo/saltfs/issues/new)!
 
 ## Travis