Describe the bug
In the new PDF timetable ( which looks great btw.) the index page show the absolute page number, while the page numbering really starts after the index.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://indico.frm2.tum.de/event/484/
2. Click on time table
3. Click on timetable pdf
4. See that e.g. the first entry is on page 3, but if you look at the page number on that page it is actually 1

Expected behavior
Consistent numbering