Automate dependency page

[fsimonis]

Repology provides an unstable API and database dumps for its data:

https://repology.org/api/v1
https://dumps.repology.org/README.txt

We could use this to fetch the versions of the dependencies for the Ubuntu baseline and keep the dependency section updated.

[fsimonis]

Problem: the database dumps are enormous, and the API is heavily rate-limited.

[fsimonis]

pkgs.org offers API access for Gold supporters at https://pkgs.org/premium/

Gold Membership
€4.50 / month (plus VAT)

I asked if they would provide a reduced plan for super low API usage.

[MakisH]

I now added repology badges/links to each dependency in #618, mostly as a convenience for us. You also added a repology overview for preCICE in the system packages page in #620.

Given that automation here might be complicated for little benefit, what should we still do?

We change the baseline so rarely and we define the requirements in various places, that I think we should rather manually check every time.