Re-render KQVI mermaid chart at higher resolution with source link

- Extract original mermaid code from git history (faa30b9)
- Create kings-quest-vi-chart.mmd with raw mermaid source
- Render preview at 3000px wide (247KB PNG)
- Render full-size at 6000px wide (657KB PNG)
- Add link to raw mermaid source file in markdown
- Also fix: set mermaid startOnLoad: false to prevent duplicate renders

mermaid-init.js

@@ -17,7 +17,7 @@
     }
 
     const theme = lastThemeWasLight ? 'default' : 'dark';
-    mermaid.initialize({ startOnLoad: true, theme });
+    mermaid.initialize({ startOnLoad: false, theme });
 
     // Simplest way to make mermaid re-render the diagrams in the new theme is via refreshing the page