Shell modules not imported anywhere

[NachoVazquez]

Hello, @manfredsteyer,

I'm writing an article about the different variations of Shell libraries in Monorepos and Nx. I came to this repo looking for validation about how your shell library was implemented when I noticed that it was not used anywhere.

I expect to find it imported in the app.module instead of the individual feature modules from its BC.

Sorry for the informal Issue, and thanks for your contributions to the community.