chore: restructured project, updated readme

src/ui/dialogs/docuprint.py

@@ -2,8 +2,8 @@ from natsort import natsorted
 from PySide6 import QtWidgets
 
 from src import Icon
-from src.backend import Database
-from src.logic import Semester
+from src.database import Database
+from src.core.models import Semester
 from src.utils.richtext import SemapSchilder, SemesterDocument
 
 from .dialog_sources.documentprint_ui import Ui_Dialog