Merge branch 'kc-remove-legacy-external' into 'develop'

removes legacy on external cards

See merge request R3/howto-cards!500

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

@@ -8,7 +8,6 @@ redirect_from:
   - /external/cards/publication-code:add-gitignore
   - /publication-code/add-gitignore
   - /external/external/publication-code/add-gitignore/
-legacy_from:
   - /cards/publication:add-gitignore
   - /external/cards/publication:add-gitignore
   - /publication/add-gitignore

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

@@ -8,7 +8,6 @@ redirect_from:
   - /external/cards/publication-code:publish-repo
   - /publication-code/publish-repo
   - /external/external/publication-code/publish-repo/
-legacy_from:
   - /cards/publication:publish-repo
   - /external/cards/publication:publish-repo
   - /publication/publish-repo