remove creativecommons-certificate-landing-page repo

Author: possumbilities

ccos/manage/projects.yml

@@ -10,7 +10,6 @@ possumbilities:  # Web Development and Web Support
   - cc-license-chooser
   - cc-resource-archive
   - cc-usability-prototypes
-  - certificates-landing-page-theme
   - chapters
   - chooser
   - commoners