Fix: Also prevent creation of customer with blank phone number when adding a guest book.
Feature: Show the old bill of a customer in guest book
Fix: In reprint, allow changing of customer
Chore: Updated dependencies
Moved to sqlalchemy 2.0
Added type checking as much as possible
Updated angular to 15
Moved from Angular flex layout to tailwind css
Started developing on vscode with devcontainers
They are also linked to products / menu categroies as to which products they can be used on
The linking to menu categories is done in the frontend, database is linked directly to products
Treeview for menu categories yet to be done in modifier category detail form