Autopublish to GitHub Pages from master when PRs are merged

[loredanacirstea]

Tried GitHub Actions - unsuccessful.

Script:
https://github.com/loredanacirstea/taylor/actions/runs/123075416/workflow

Errors: https://github.com/loredanacirstea/taylor/runs/732783318?check_suite_focus=true

[INFO] first deployment, create new branch gh-pages
  ENOENT: no such file or directory, scandir '/home/runner/work/taylor/taylor/build'
  /usr/bin/git init
  Reinitialized existing Git repository in /home/runner/actions_github_pages_1591139872206/.git/
  /usr/bin/git checkout --orphan gh-pages
  fatal: A branch named 'gh-pages' already exists.
  ##[error]Action failed with "The process '/usr/bin/git' failed with exit code 128"