Redux Toolkit

[lauslim12]

Quite a large PR:

• Use Redux Toolkit (RTK) to practice global state management with it, to know more than just Context API.
• Create Redux store, hooks, and migrate code from Context API to Slices.
• Adjust components, states, and localStorage accordingly.
• Delete unused code.
• Create additional typing for media queries, and fix visual bug in some laptop screens.
• Refactor Drinks component.
• Debounce store subscription to prevent lag.
• Write test utilities, made sure it integrated well with react-i18next, styled-components, and @reduxjs/toolkit.
• Write more tests, made sure the code coverage was 100%, and fix minor bugs.
• Update documentation.