[DOC] - FAQ - Dying nodes on AWS due to AZRebalance

[kcpevey]

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

We have an FAQ topic on how to resolve this in the old docs that needs to be migrated over.

https://docs.qhub.dev/en/stable/source/admin_guide/faq.html?highlight=dask#on-aws-why-do-user-instances-occasionally-die-30-minutes-after-spinning-up-a-large-dask-cluster

Steps to Resolve this Issue

add faq item

[pavithraes]

We'll need to verify if this is still an issue, and document it if it is