80-pdf-in-white-mode

Related issues

the following issue is solved #126

Acceptance criteria

• Implemented code changes don't diverge from the related issue.
• Documentation reflects the status quo after merge.
• Version number is incremented according to SemVer. (Snapshot versions are not merged/released.)
• Only released versions of dependencies are used (i.e. no snapshot versions).
• Pipeline still works.
• GitLab issue is up-to-date.

If necessary, the following sections have been updated:

• Swagger
• Readme.md
• Documentation

Proposed squash commit message

PDF creation is now in the backend

• ecmr PDF is now generated in the backend using jasper report.
• ecmr PDF is only one page in portrait mode, 2 if there is more than three items
• Deleted code from frontend that generates pdf using jsPDF

Closes #80 (closed)