Update Contribute.md, microsoft#1502 (microsoft#1508)

website/docs/Contribute.md

@@ -201,6 +201,7 @@ pip install pydoc-markdown  # skip if you use the dev container we provided
 cd website
 yarn install --frozen-lockfile --ignore-engines
 pydoc-markdown
+quarto render ./docs
 yarn start
 ```
 
@@ -225,6 +226,7 @@ Once at the CLI in Docker run the following commands:
 cd website
 yarn install --frozen-lockfile --ignore-engines
 pydoc-markdown
+quarto render ./docs
 yarn start --host 0.0.0.0 --port 3000
 ```