Docs - remove Serverless

[mykaul]

https://python-driver.docs.scylladb.com/stable/scylla-cloud-serverless.html is no longer relevant
CC @tzach

[Lorak-mmk]

Won't it become relevant again in the future?

[annastuchlik]

I've removed everythig about serverless from the Cloud docs, including the section this page is referring to: https://cloud.docs.scylladb.com/stable/serverless/index.html.
Please remove https://python-driver.docs.scylladb.com/stable/scylla-cloud-serverless.html from the Driver docs.

[mykaul]

Won't it become relevant again in the future?

Maybe, but that's not a reason to keep it now.