Remove PR previews for now (#1595)

Part of #1043. Code Engine
is shut down tomorrow, so we need to turn off previews for now.

We're still working on what the replacement is. Once that's ready, we'll
revive whichever of these files are relevant.

Author: Eric-Arellano

.github/actions/set-up-ibm-cloud/action.yml

@@ -89,18 +89,6 @@ API docs authors can preview their changes to one of the APIs by using the `-a`
 1. Run `npm run gen-api -- -p <pkg-name> -v <version> -a <path/to/docs/_build/html>`.
 2. Execute `./start` and open up `http://localhost:3000`, as explained in the prior section.
 
-## Preview the docs in PRs
-
-Contributors with write access to this repository can use live previews of the docs: GitHub will deploy a website using your changes.
-
-To use live previews, push your branch to `upstream` rather than your fork. GitHub will leave a comment with the link to the site. Please prefix your branch name with your initials, e.g. `EA/fix-build-typo`, for good Git hygiene.
-
-## Staging
-
-We also re-deploy the docs every time we merge into `main` at the site https://qiskit-docs-preview-staging.1799mxdls7qz.us-south.codeengine.appdomain.cloud.
-
-This staging environment can be useful to see how the docs are rendering before we push it live to production.
-
 ## Execute notebooks
 
 Before submitting a new notebook or code changes to a notebook, you must run