adapt header

external/publication/add-gitignore/add-gitignore.md

 ---
 layout: page
-permalink: /external/ppc/add-gitignore/
-shortcut: ppc:add-gitignore
+permalink: /external/publication/add-gitignore/
+shortcut: publication:add-gitignore
 redirect_from:
-  - /cards/ppc:add-gitignore
-  - /external/cards/ppc:add-gitignore
+  - /cards/publication:add-gitignore
+  - /external/cards/publication:add-gitignore
 ---
 
 # Add a .gitignore to your repository

external/publication/publish-repo/publish-repo.md

 ---
 layout: page
-permalink: /external/ppc/publish-repo/
-shortcut: ppc:publish-repo
+permalink: /external/publication/publish-repo/
+shortcut: publication:publish-repo
 redirect_from:
-  - /cards/ppc:publish-repo
-  - /external/cards/ppc:publish-repo
+  - /cards/publication:publish-repo
+  - /external/cards/publication:publish-repo
 ---
 
 # Publish a repository