Use DEPENDS.txt for automatic dependency resoultion
According to https://tug.org/texlive/pkgdepend.html, it's possible to add a `DEPENDS.txt` to the package main contents when uploading to CTAN, resulting in automatic dependency installation when installing bfh-ci. Currently users need to download `requirements.txt` and install the packages in there using `tlmgr`. As we want to simplify the process for students as much as possible I propose we upload the `DEPENDS.txt` to CTAN as well. Unfortunately, we can't test locally with `DEPENDS.txt` (at least not in a different way as we did until now) so we need to upload to make first test to see if it works. I already prepared a MR: https://gitlab.ti.bfh.ch/bfh-latex/bfh-ci/-/merge_requests/66 Example: https://tug.ctan.org/macros/context/base/DEPENDS.txt
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