Reorganize: Move all skills to skills/ folder

- Created skills/ directory
- Moved 272 skills to skills/ subfolder
- Kept agents/ at root level
- Kept installation scripts and docs at root level

Repository structure:
- skills/           - All 272 skills from skills.sh
- agents/           - Agent definitions
- *.sh, *.ps1       - Installation scripts
- README.md, etc.   - Documentation

Co-Authored-By: Claude <noreply@anthropic.com>

skills/superdesign/skill.md

@@ -0,0 +1,34 @@
+---
+name: superdesign
+description: >
+  Superdesign is a design agent, where it specialised in frontend UI/UX design; Use this skill before you implement any UI that require some design thinking. Common commands: superdesign create-project --title "X" --template .superdesign/replica_html_template/home.html --json (setup project), superdesign iterate-design-draft --draft-id <id> -p "dark theme" -p "minimal" -p "bold" --mode branch --json (design iterate based on template or existing draft)
+metadata:
+  author: superdesign
+  version: "0.0.1"
+---
+
+SuperDesign helps you (1) find design inspirations/styles and (2) generate/iterate design drafts on an infinite canvas.
+
+---
+
+# Core scenarios (what this skill handles)
+
+1. **Help me design X** (feature/page/flow)
+2. **Set design system**
+3. **Help me improve design of X**
+
+# How it works
+Fetch fresh guidelines below:
+```
+https://raw.githubusercontent.com/superdesigndev/superdesign-skill/main/skills/superdesign/SUPERDESIGN.md
+```
+
+Action accordingly based on instruction in the guidelines
+
+# Superdesign CLI
+
+```
+npm install -g @superdesign/cli@latest
+superdesign login
+superdesign --help
+```