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/ui-design/skills/interaction-design/SKILL.md

@@ -318,10 +318,3 @@ function AnimatedComponent() {
 - **Blocking Interactions**: Never prevent user input during animations
 - **Memory Leaks**: Clean up animation listeners on unmount
 - **Flash of Content**: Use `will-change` sparingly for optimization
-
-## Resources
-
-- [Framer Motion Documentation](https://www.framer.com/motion/)
-- [CSS Animation Guide](https://web.dev/animations-guide/)
-- [Material Design Motion](https://m3.material.io/styles/motion/overview)
-- [GSAP Animation Library](https://greensock.com/gsap/)