fix clone command on set up page so it works with copy to clipboard

docs/modules/ROOT/pages/set-up-project.adoc

@@ -9,8 +9,8 @@ The sources can be {url-project}[Antora's default UI] or an existing UI project
 To start, clone the default UI project using git:
 
 [subs=attributes+]
- $ git clone {url-project} &&
-   cd "`basename ${_%.git}`"
+ $ git clone {url-project}
+ $ cd "`basename ${_%.git}`"
 
 The example above clones Antora's default UI project and then switches to the project folder on your filesystem.
 Stay in this project folder in order to initialize the project using npm.