Pdated guide with tutorial for using podman+scripts for persistent multisession containers

I have updated a guide with tutorial at https://cnest.readthedocs.io for using Podman + small Bash scripts for personalized persistent multisession containers.

Using Podman + small Bash scripts is an alternative to using Toolbx and Distrobox. It is more challenging to use Podman + Bash scripts, but this guide and the tutorial can make it easier.

The guide at https://cnest.readthedocs.io discusses some of the reasons one might prefer to use Toolbx/Distrobox versus direct Podman+scripts or vice versa.

This update reflects a greatly simplified version 2 of the cnest package. This simplification reflects an increase in the functionality of Podman over hte years and lessons learned from taking this approach since 2020.

Feedback is welcome.