user-select css property is not needed

Shell prompt is already unselectable
Co-authored-by: NJonathan Hefner <jonathan@hefner.pro>

guides/assets/stylesheets/main.css

@@ -734,7 +734,6 @@ code.language-shell-session span.token.command {
 }
 span.token.sh.important {
   margin-right: 0.5em;
-  user-select: none;
 }
 
 /* Edge Badge