Update setup.md

See also datacarpentry/genomics-workshop#63

setup.md

@@ -4,9 +4,6 @@ title: Setup
 ---
 
 This workshop is designed to be run on pre-imaged Amazon Web Services 
-(AWS) instances. All the software and data used in the workshop are 
-hosted on an Amazon Machine Image (AMI). For information about how to
+(AWS) instances. For information about how to
 use the workshop materials, see the 
-[setup instructions](http://www.datacarpentry.org/genomics-workshop/setup/) on the main workshop page.
-
-Windows users should also download and install [PuTTY](http://www.putty.org/). 
+[setup instructions](http://www.datacarpentry.org/genomics-workshop/setup.html) on the main workshop page.