Update/upgrade deploy workflow

[armanbilge]

I think the peaceiris action has fallen out of maintenance. We should investigate the official upload-pages-artifact action.

typelevel.github.com/.github/workflows/ci.yml

Lines 25 to 30 in 3907b36

	- if: github.event_name != 'pull_request'
	uses: peaceiris/actions-gh-pages@v4.0.0
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}
	publish_dir: target
	cname: typelevel.org

[reardonj]

I recently switched my ancient Jekyll default site to use a new-style workflow using upload-pages-artifact. It was pretty trivial.

For reference: https://github.com/reardonj/reardonj.github.io/blob/master/.github/workflows/jekyll.yml