doc update

Author: chrischoy

docs/README.md

@@ -13,6 +13,6 @@ Include the markdown file in `index.rst` `toctree`.
 You may modify the landing page `index.rst` itself in reStructuredText format.
 
 ## Generate HTML documentation website
-`make html`
+`cp ../README.md overview.md; make html`
 You may ignore the consistency warning that README.md is not included in toctree. README.md is this file, the instruction to generate documentation website.
 The website is generated in `_build/html`