Revert "Revert "build: Preview deployments: false (#34)""

This reverts commit 9a1271b.

Because that didn't work; see EndBug/pages-preview#21 (comment).

Author: vorburger

.github/workflows/preview.yaml

@@ -66,6 +66,8 @@ jobs:
       - uses: vorburger/pages-preview@a5d03757567f1de500903d9cf7e35c99a7514d69
         with:
           build_dir: site
+          # https://github.com/EndBug/pages-preview/issues/20
+          deployments: false
           preview_base_url: ${{ env.PAGES_BASE }}
           preview_repo: ${{ env.PREVIEW_REPO }}
           preview_token: ${{ secrets.PREVIEW_TOKEN }}