Add a more in-depth installation guide

[RichardPfr]

The current guide works, though may not be accurate or in-depth enough.
Having pictures or even a video for all subsequent steps, even after the installation of Python (as currently), may be more understandable.

Additionally @mxstrl is currently testing this out himself and with some students so he will be able to give a better overview what steps are needed or which can cause troubles during installation.

Also it might be good to, from our side, define a optimal working environment, define how PyRolL is best used and also go through its setup during this guide.
May include:

• installation of an IDE (Pycharm)
• setup of virtual environments (hatch)
• introduction to an optimal workflow (define .venv via tomls, initialize venv, use PyRolL in venv)

If we define such a fixed workflow we could also provide templates for it (hatch.toml, pyproject.toml, jupyter-notebook with basic setup).

Everyone more experienced with Python and its usage will know where he can do something differently to our example.