GH-16186: Updating user guide pages for Cloud Integration to reflect makersaurus guidelines

[hannah-tillman]

#16186

This PR updates the cloud integration pages to adhere to the style guide.

Question: I was testing out all the links and found that the ones for the IBM Data Science Experience page kept 404-ing. I tried to find it by searching IBM and couldn't. Any idea on if that still exists?

Another question: On nimbux, the repo we mention doesn't exist anymore: opsh2oai. Any idea what it is now?

[wendycwong]

@hannah-tillman : I will ask Satish to send someone to review this one you.

[coolsat]

@mohamedasni can you review this please or have someone from the team do this? thanks