restructure cloud setup file

[beckykd]

closes #3439
closes #3514
closes #3513

see
https://qiskit.github.io/documentation/pr-3478/docs/guides/cloud-setup
https://qiskit.github.io/documentation/pr-3478/docs/guides/cloud-setup-invited

[qiskit-bot]

One or more of the following people are relevant to this code:

• @abbycross
• @beckykd

[abbycross]

Looks good! I only suggested removing the early access admonition. I also think we should have @Matt-Stypulkoski look at the invited user instructions in case he has other thoughts.

[beckykd]

Looks good! I only suggested removing the early access admonition.

Oh, I thought that would be pulled in from main, so I left it alone.

[francabrera]

In addition to the comments, we should also talk about regions and how to switch regions at the top right corner (next to the account switcher), and that the same API Key can be used to connect to the two regions.

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[jan-an]

Hi! There are some inconsistencies in how we refer to the API key in the cloud set up guide https://quantum.cloud.ibm.com/docs/en/guides/cloud-setup
In steps 5 and 6, we refer to them as both API key and API token. In case this is a potential source of confusion for users, can we can address this?

[beckykd]

both API key and API token

We'd like to address this, but it's built into Qiskit as "key" and it's "token" on Cloud. We've been trying to explain everywhere that key = token. Do you have suggestions to improve this?

[beckykd]

both API key and API token

We'd like to address this, but it's built into Qiskit as "key" and it's "token" on Cloud. We've been trying to explain everywhere that key = token. Do you have suggestions to improve this?

I added an FAQ.