Add validation and testing for ghost content extraction

- Create validation script to verify implementation
- Add test file for ghost profile rendering
- Validate all components work together correctly
- Ready for CI/CD pipeline testing

test-ghost-profile.md

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+# Test Ghost Profile Output
+
+This is a test document to validate our ghost profile setup.
+
+## Content Structure
+
+The ghost profile should:
+- Remove navigation elements
+- Use minimal styling from ghost-iframe.css
+- Maintain clean article layout
+- Remove table of contents
+
+## Code Example
+
+```julia
+println("Hello from Julia!")
+x = 1 + 1
+```
+
+## Regular Content
+
+This is just some regular markdown content to see how it renders in the ghost profile.
+
+- List item 1
+- List item 2
+- List item 3
+
+**Bold text** and *italic text* should render properly.
+
+[Link to main site](https://projects.ansonbiggs.com)
+
+## Summary
+
+If you can see clean, minimal styling without navigation, the ghost profile is working correctly.