Show serving docs with nox in README

Co-authored-by: Matthew <[email protected]>

Author: NickleDave

README.md

@@ -59,8 +59,7 @@ git clone [email protected]:ResearchCodeReviewCommunity/dev-review.git
 To preview changes, you can build and serve the website locally.
 
 ```
-sphinx-build -nW --keep-going -b html doc/ doc/_build/html
-cd doc/_build/html; python -m http.server;cd ../../..
+nox -s docs -- serve
 ```
 
 Open your favorite web-browser using the following url: