Update deploy.yaml

Author: hamelsmu

.github/workflows/deploy.yaml

@@ -29,7 +29,7 @@ jobs:
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           force_orphan: true
-          publish_dir: ./docs
+          publish_dir: ./_docs
           # The following lines assign commit authorship to the official
           # GH-Actions bot for deploys to `gh-pages` branch:
           # https://github.com/actions/checkout/issues/13#issuecomment-724415212