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/startup-business-analyst/skills/competitive-landscape/SKILL.md

@@ -499,17 +499,6 @@ If "no" to any, it's not a sustainable advantage.
 - Major strategy reassessment
 - Market trends analysis
 
-## Additional Resources
-
-### Reference Files
-
-- **`references/frameworks-deep-dive.md`** - Detailed application of each framework with worksheets
-- **`references/intel-sources.md`** - Comprehensive list of competitive intelligence sources
-
-### Example Files
-
-- **`examples/competitor-analysis.md`** - Complete competitive analysis for a SaaS startup
-- **`examples/positioning-workshop.md`** - Step-by-step positioning development process
 
 ## Quick Start
 
@@ -523,5 +512,3 @@ To analyze competitive landscape:
 6. **Analyze pricing** - Where do you fit?
 7. **Assess advantages** - What's defensible?
 8. **Develop strategy** - How to win
-
-For detailed frameworks and examples, see `references/` and `examples/`.