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/python-development/skills/uv-package-manager/SKILL.md

@@ -811,24 +811,3 @@ uv cache clean              # Clear cache
 uv cache dir                # Show cache location
 uv --version                # Show version
 ```
-
-## Resources
-
-- **Official documentation**: https://docs.astral.sh/uv/
-- **GitHub repository**: https://github.com/astral-sh/uv
-- **Astral blog**: https://astral.sh/blog
-- **Migration guides**: https://docs.astral.sh/uv/guides/
-- **Comparison with other tools**: https://docs.astral.sh/uv/pip/compatibility/
-
-## Best Practices Summary
-
-1. **Use uv for all new projects** - Start with `uv init`
-2. **Commit lockfiles** - Ensure reproducible builds
-3. **Pin Python versions** - Use .python-version
-4. **Use uv run** - Avoid manual venv activation
-5. **Leverage caching** - Let uv manage global cache
-6. **Use --frozen in CI** - Exact reproduction
-7. **Keep uv updated** - Fast-moving project
-8. **Use workspaces** - For monorepo projects
-9. **Export for compatibility** - Generate requirements.txt when needed
-10. **Read the docs** - uv is feature-rich and evolving