Doku intro

[hgloeckner]

rearranged doku website

• data has now a short description of directories; removed the fixed structure because it is not longer true
• added a note to the jupyter notebooks that they are probably outdated
• added Data and Operations as their own sections.
• added the config description to getting started
• corrected the installation and call of halodrops

[hgloeckner]

as a side effect: the api references are updated

[tmieslinger]

Thanks for updating so much of the docu! That's a big step forward. I made small edits here and there. Feel free to accept the suggestions as you see fits.

The API docs part seems auto-generated. However, I was surprised to see it in this PR. Should we try to rather integrate it into the CI somehow for the future? I don't know how that exactly works, but I'll open an issue for it :)

[tmieslinger]

Ah, I forgot to say that I rendered the docu locally and checked the changes meaning that all images are still displayed and all chapters are reachable and so on. All good from that side :)

[tmieslinger]

One more thought on this PR, you could think of merging all documents under docs/source/tutorial into one page. I think I'd prefer that as it's not much content at the moment

[hgloeckner]

Thanks for reading everything. I would keep the tutorial separate. I hate long explanation pages (also, I think an 'Installation' link helps to find it faster). but maybe that's just personal.

It would be cool to build the api references automatically. Maybe we can figure that out :)