Update README for deployment

Author: brentvatne

README.md

@@ -18,7 +18,7 @@ Only collaborators on this repository can deploy. `cd` into the website director
 
 ```bash
 GIT_USER=your_github_username \
-STABLE_RELEASE=ya \
+STABLE_RELEASE=true \
 CURRENT_BRANCH=source \
 USE_SSH=true \
 yarn run publish-gh-pages
@@ -28,7 +28,6 @@ yarn run publish-gh-pages
 
 ```bash
 GIT_USER=your_github_username \
-GIT_REMOTE=pre \
 CURRENT_BRANCH=source \
 USE_SSH=true \
 yarn run publish-gh-pages