Port-an-existing-app-to-OOD.md

@@ -58,7 +58,6 @@ For details, see:
 
 ```diff
 +gem 'ood_appkit', '~> 0.3.0'
-+gem 'pbs', '~> 2.0'
 +gem 'awesim_branding', :git => 'git@github.com:AweSim-OSC/awesim_branding.git', :tag => 'v1.0.0'
 ```