Changes from issues, that impact all books in carnival theme need to be tested in polish Physics, all three volumes.
[ ] Reduce font size for References - #4595
[ ] Reduce spacing - #4590
[ ] Reduce font size for headers - #4591
[ ] Change base font from ibm plex serif to sans - #4599
Fizyka couldn't be tested with other books, because licence url in collection didn't matched licence url in github.
Changes from issues, that impact all books in carnival theme need to be tested in polish Physics, all three volumes.