Update deploy workflow (seanprashad#201)

* Remove PR deployments * Add GITHUB_TOKEN

Author: seanprashad

.github/workflows/github-pages.yml

@@ -26,3 +26,5 @@ jobs:
  with:
  target_branch: gh-pages
  build_dir: build
+ env:
+ GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}