Draft: Resolve "Representing notebooks as custom ELN schema"

Closes #1549 (closed) Implementing notebook interface as a python schema.

Plan:

• create a separate repo for the plugins (separate the notebook schema from the ai-toolkit) like nomad-app-aitoolkit and nomad-app-notebooks
• add them to dependencies as a submodule (I think this is mandatory for making sure it works.)
• the plugin will not be included into the python package but it will be integrated into the image by some Dockerfile magic
• create a custom nomad.yaml file for our different deployments (prod, staging, dev) which includes all the app configs