v2.3.0

Since 2.2.2:
feat: 2.3 environment files and pinned yamls
fix: remove ipyvolume from labextensions
docs: Update README for 2.3
feat: use channels from .env file in pinned yaml
docs: add list command to help, and display default
feat: on Ubuntu detect .run file was used and guide user to solution
fix: change how notebook repo is cloned and submodules handled.
feat: update versions to 2.3.0 and RAPIDS 0.13.
feat: add list command
fix: display default stack in help message
feat: log command used to pin, output to -pinned.yaml
docs: add CONTRIBUTING.md