Datasets quick fixes + SQLAlchemy addition + CFF updates

[egpbos]

Changes in this PR

Fixes:

• Layout fixes in the datasets chapter that was added today (I did do the local preview this time that the checklist told me to do 😅).
• Added @suvayu, @f-hafner and @recap as page owners, if you all agree :)
• Added the authors of the datasets chapter to the CFF file (...again, as the checklist suggested 🫣)

Adds:

• In (Python) database tools / chapter? #316 we discussed (among many things) replacing all the Python chapter database interfaces with SQLalchemy. I now added mention of this to the databases chapter. Closes (Python) database tools / chapter? #316.
• The CFF file was not updated much for the past 5 years. I went through past closed PRs to add the author names. If people want to add their ORCID, feel free to suggest in a review comment, or simply push it to this branch.

Checklist

• I previewed my changes locally using e.g. python3 -m http.server 4000 and confirmed they work correctly.
• My name AND MANY OTHERS ;) was added to the CITATION.cff file.

[suvayu]

I was thinking maybe piccolo deserves a mention here, considering it's much simpler, and probably better fit for smaller projects.

[egpbos]

Please, by all means, add it. I am not at all an expert on databases, this is just a thing I happen to have used once.

[egpbos]

Or perhaps we can do that in another PR and I'll just make an issue about it first to remember (maybe others have additional ideas that they can discuss there).

[egpbos]

Done #346. Thanks for the review!