Remove use of pathlib

[samm82]

Trying to make compile results in the following error:

$ make compile
pyinstaller --onefile src/Main.py -n WorshipList -i src/icon.ico -w
The 'pathlib' package is an obsolete backport of a standard library package and is incompatible with PyInstaller. Please remove this package (located in C:\Users\samcr\AppData\Local\Programs\Python\Python312\Lib\site-packages) using
    "C:\Users\samcr\AppData\Local\Programs\Python\Python312\python.exe" -m pip uninstall pathlib
then try again.
make: *** [compile] Error 1

pathlib should be replace with a more standard library