[MAINT] - Move docker-images repo back to main nebari's repo

[viniciusdc]

Context

Currently, our Docker images are maintained separately from our main source code, and while this setup has worked well for a long time, it often leads to issues when releasing or merging changes to that separate repository. This is because it can result in errors if the Docker images are not fully tested in sync with the main source code.

Value and/or benefit

• better testability and issue tracking

Anything else?

No response