Remove docker-generate and docker-notation code

[dtzar]

Discussed in #251

^{Originally posted by dtzar July 18, 2022}
Are you using or plan to use docker-generate or docker-notation in the repository?

Should this be converted to a plugin in a different repository?

This was brought up in a PR and good to consider by the community and group of maintainers. We would like feedback and a discussion here.

[dtzar]

This issue was closed via PR #269