Update documentation to reflect the usage of the account email

[luckylwk]

It wasn't clear to us when using this that the API Token would not be used as a Bearer token when also providing the email address. Removing the email address immediately resolved the issue.

cloudflare-preview-url/cloudflare.js

Lines 22 to 29 in f5a8ce5

	const headers = accountEmail
	? {
	'X-Auth-Key': token,
	'X-Auth-Email': accountEmail
	}
	: {
	Authorization: `Bearer ${token}`
	}

[PatrickHeneise]

Thanks for the feedback. It's been a while, but I think that depends on what account type you have? For my own website I use:

- name: cloudflare-preview-url
  uses: zentered/cloudflare-preview-url@v1.4.0
  id: cloudflare_preview_url
  env:
    CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
    CLOUDFLARE_ACCOUNT_EMAIL: ${{ secrets.CLOUDFLARE_ACCOUNT_EMAIL }}
    CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
  with:
    cloudflare_project_id: ''
    wait_until_ready: true

Which works fine; Is that a documentation issue or has something changed in Cloudflare API auth that I should be aware of?