* confirm CC-by-sa licensing by all participants
    * Jonas: ok
  * add Gantt diagram below plans
  * generate PDF/A compliant PDF files
    <https://www.aalto.fi/en/services/creating-a-pdfa-compliant-file-of-your-thesis>
    <https://tex.stackexchange.com/a/655531/309738>
  * maybe tweak PDF tagging
    <https://ctan.org/pkg/tagpdf>
    <https://tex.stackexchange.com/a/609329/309738>
  * validate generated PDF
    * https://www.pdf-online.com/osa/validate.aspx
    * https://demo.verapdf.org/
  * maybe enable more DocumentMetadata options
    <https://tex.stackexchange.com/a/686905/309738>
  * maybe document revived XMP ontologies somewhere
    <https://stackoverflow.com/a/73730400/18619283>