Remove duplicate unzip command from index page

Author: alefteris

index.html

@@ -70,7 +70,6 @@ <h2>How to Think Like Git</h2>
  $ wget http://sample.com/project.2010-06-01.zip
  $ unzip project.2010-06-01.zip
  $ cp -R project.2010-06-01 project-my-copy
- $ unzip project.2010-06-01.zip
  $ cd project-my-copy
  $ (change something)
  $ diff project-my-copy project.2010-06-01 > change.patch