feat: implement zero-configuration auto-enhancement demo workflow

- Add intelligent auto-enhancement that detects viable content elements
- Replace manual enhancement with automated container-first detection
- Support inline formatting (strong, em, span, links) within editable content
- Streamline demo workflow: just demo shows options, auto-enhances on demand
- Clean up legacy commands and simplify directory structure
- Auto-enhancement goes directly from source to demo-ready (no intermediate dirs)
- Add Dan Eden portfolio and simple test sites for real-world validation
- Auto-enhanced 40 elements in Dan Eden portfolio, 5 in simple site
- Achieve true zero-configuration CMS experience

test-sites/templates/insertr-config.template.json

@@ -0,0 +1,28 @@
+{
+  "site_name": "{{SITE_NAME}}",
+  "description": "{{SITE_DESCRIPTION}}",
+  "base_url": "{{BASE_URL}}",
+  "content_sections": [
+    {
+      "selector": ".hero-content",
+      "type": "markdown",
+      "editable": true,
+      "description": "Hero section content"
+    },
+    {
+      "selector": ".feature-block",
+      "type": "markdown", 
+      "editable": true,
+      "description": "Feature description blocks"
+    },
+    {
+      "selector": ".about-content",
+      "type": "markdown",
+      "editable": true,
+      "description": "About section content"
+    }
+  ],
+  "css_frameworks": ["{{CSS_FRAMEWORK}}"],
+  "complexity": "{{COMPLEXITY}}",
+  "testing_notes": "{{TESTING_NOTES}}"
+}