[DOC] - Review installation and setup docs for each cloud provider

Preliminary Checks

• This issue is not a question, feature request, RFC, or anything other than a bug report. Please post those things in GitHub Discussions: https://github.com/nebari-dev/nebari/discussions

Summary

Nebari has recently changed a lot since we first wrote the cloud provider guides on setting up accounts and performing the first. deployment, many changes might have changed internally within the provider's own docs as well as upstream within nebari (libs or requirements might've changed)

The goal is to review these pages and ensure they are concise and up to date. Deployment

Steps to Resolve this Issue

1. Identify, if present, issues with the current setup docs for each provider and remediate with respective PRs
2. Assert the steps outlined in the docs are still "feasible," leading to a successful deployment of nebari.
   ...

Start by locating the installation and account-setup pages for each cloud provider, then compare their steps with the current Nebari deployment requirements and the providers' documentation. Confirm that the documented process remains feasible through a successful deployment, and update the affected pages so they are concise and current.