Update deploy workflow to use "master" branch

Author: AlexITC

.github/workflows/deploy.yml

@@ -3,7 +3,7 @@ name: Deploy to GitHub Pages
 on:
   # Runs on pushes targeting the `main` branch
   push:
-    branches: [ "main" ]
+    branches: [ "master" ]
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch: