Add AiiDA base example notebook

[mbercx]

Add a very basic implementation of the EOS work chain using aiida-shell. Missing some provenance features, but already has parsing into nodes implemented for the Quantum ESPRESSO calculation.

[GeigerJ2]

Difficult to review on GH directly as the notebook is shown in raw JSON :D But a few comments:

• Overall, is very nice now, very simple (despite missing some features, like full provenance, but we are not aiming for that here anyway)
• Maybe provide a link to the aiida-shell repo?
• Just as a reminder that the write_input function currently in functions.py (which will eventually end up in a shared directory to be imported into all notebooks, I suppose?) should also contain the extra return_string argument
• I would maybe add some additional text introducing AiiDA concepts, such as Data nodes, as is done for jobflow, and then comment on why, e.g., SinglefileData.from_string is used in the call to launch_shell_job. Though, I guess this depends on how verbose the notebooks should finally be. I can add a commit on top of this PR, if that's OK, @mbercx?
• Also, happy to add some text to the remaining entries!

[GeigerJ2]

Suggested change

	def append_to_list(lst: list, item: float):
	lst.append(item)
	def split_string(string: str, character: str) -> list:
	return string.split(character)

[jan-janssen]

It would be great if you could also add the notebook to the continuous integration environment. The previous aiida notebook is tested automatically, so it should be possible to adjust the GitHub CI to test the new notebook. In addition, you can remove the old notebook, so we do not confuse the readers.