Add rdmo-admin script

[jochenklar]

This PR adds a rdmo-admin script, which works like the django-admin script and offers a way to use management scripts outside an rdmo-app (e.g. in the rdmo repo).

(My) use cases are:

rdmo-admin npm run install
rdmo-admin npm run watch
...

instead of

nvm use
npm run watch
...

or

rdmo-admin build

instead of

python -m build

which might not be to impressive, but has a more uniform interface and might be easier to document.

I think this could really be helpful if we extent it to help with the setup of RDMO, something like

pip install rdmo
rdmo-admin init

We could even think about replacing rdmo-app with a cookiecutter, but I am not sure about this, yet.

Another use case would be to simplify the makemessages step.

Any other ideas are welcome. Also, do we need this or is this additional complexity.

[coveralls]

coverage: 90.409% (-0.07%) from 90.478%
when pulling b46853f on rdmo_admin
into 1eadee5 on main.

[MyPyDavid]

rdmo-admin startapp ?? 😅

[jochenklar]

Maybe we should combine commands, build could run npm run build:prod and python -m build, while watch just runs npm run watch.

[jochenklar]

After some thoughts I am wondering if this only solves my problems and could be better solved with a local custom script or Makefile. We can discuss this in our next meeting.

[MyPyDavid]

I would keep it, think it's also useful for the local dev setup..

[jochenklar]

Rebased and ready (after tests are ok).