Move "demo" dir to "docs"

Author: grega

README.md

@@ -44,7 +44,7 @@ const result = friendlyExplain({
 // or use result.title, result.summary, result.steps, result.patch, result.trace
 ```
 
-See the [demo](demo/README.md) for a full set of examples.
+See the [demo](docs/README.md) for a full set of examples.
 
 ## Development
 

demo/README.md renamed to docs/README.md

@@ -1,4 +1,6 @@
-# Demo
+# Documentation
+
+## Demo
 
 This directory contains a demo HTML file that showcases the Python Friendly Error Messages library.