DOC: Add resources for Python, terminal use etc.

[britta-wstnr]

Proposed documentation enhancement

We have tutorials on how to get started with MNE-Python that cover some more general aspects of Python (e.g. https://mne.tools/stable/auto_tutorials/intro/15_inplace.html).
I often get asked where to start if you do not know any Python at all yet - and as far as I am aware there is no material on the MNE homepage for that.
Maybe we could add a tutorial page with resources we can recommend for getting started with Python, numpy, or also the use of a terminal.

[drammock]

We have this page https://mne.tools/stable/overview/learn_python.html

What I'm hearing is that it's not discoverable.

[britta-wstnr]

Oh!
Well, I searched for it and did not find it. Based on the questions I get asked, it seems like it is the same for users - and it seems @larsoner was not aware either ...

Maybe we could move it to tutorials? This is where most people seem to land if they feel like they need an in-depth start.

[larsoner]

A few potential ideas

1. Move from overview to tutorials
2. Add a new tutorial intro/05_new_to_python.py that just links to the overview doc
3. Add to existing intro/10_overview.py a .. sidebar:: or so that links to the overview doc

[drammock]

IMO the docs need a medium-sized overhaul, cf #10707. I think this issue and that one should be addressed together, as I don't think we can find the "right place" for this info in the current (IMO wrong) organization of the (non-tutorial) docs content.