fix(skills): remove phantom resource references and fix CoC links (#447)

Remove references to non-existent resource files (references/, assets/,
scripts/, examples/) from 115 skill SKILL.md files. These sections
pointed to directories and files that were never created, causing
confusion when users install skills.

Also fix broken Code of Conduct links in issue templates to use
absolute GitHub URLs instead of relative paths that 404.

plugins/cicd-automation/skills/deployment-pipeline-design/SKILL.md

@@ -351,10 +351,6 @@ kubectl rollout undo deployment/my-app --to-revision=3
     fi
 ```
 
-## Reference Files
-
-- `references/pipeline-orchestration.md` - Complex pipeline patterns
-- `assets/approval-gate-template.yml` - Approval workflow templates
 
 ## Related Skills
 

plugins/cicd-automation/skills/github-actions-templates/SKILL.md

@@ -320,12 +320,6 @@ jobs:
             }
 ```
 
-## Reference Files
-
-- `assets/test-workflow.yml` - Testing workflow template
-- `assets/deploy-workflow.yml` - Deployment workflow template
-- `assets/matrix-build.yml` - Matrix build template
-- `references/common-workflows.md` - Common workflow patterns
 
 ## Related Skills
 

plugins/cicd-automation/skills/gitlab-ci-patterns/SKILL.md

@@ -246,10 +246,6 @@ trigger-child:
     strategy: depend
 ```
 
-## Reference Files
-
-- `assets/gitlab-ci.yml.template` - Complete pipeline template
-- `references/pipeline-stages.md` - Stage organization patterns
 
 ## Best Practices
 

plugins/cicd-automation/skills/secrets-management/SKILL.md

@@ -339,10 +339,6 @@ secret-scan:
   allow_failure: false
 ```
 
-## Reference Files
-
-- `references/vault-setup.md` - HashiCorp Vault configuration
-- `references/github-secrets.md` - GitHub Secrets best practices
 
 ## Related Skills