Update README Github Pages instructions

README.md

@@ -4,7 +4,7 @@ The goal of this repo is to provide a template from which students can host CS18
 
 ## Enabling Github Pages
 
-To enable Github pages, go to the 'Settings' tab then click on 'Pages'. Under 'Source', make sure that the branch is set to 'master' and the folder is set to 'root'. If these settings are correct, navigating to the github page link should render index.html
+To enable Github pages, go to the 'Settings' tab then click on 'Pages'. Under 'Build and Deployment' -> 'Branch', make sure that the branch is set to 'master' and the folder is set to 'root'. If these settings are correct, you should see a message saying "Your site is live at \[website url\]" at the top of the 'Pages' page, and navigating to the github page link should render index.html
 
 ## Adding Project Webpages