🏇🏇🏇 Refactor top-level context providers for performance

[mithi]

There are currently three top level providers for handling the ui state:

• theme
• codeTheme
• menuState
  https://github.com/mithi/epic-react-exercises/tree/main/providers

I have to refactor this to best practices so that the app will be faster considering the following techniques:

1. How to optimize your context value by separating state and dispatch

• https://kentcdodds.com/blog/how-to-optimize-your-context-value

2. By using useCallback and useMemo for state update functions https://github.com/kentcdodds/kentcdodds.com/blob/319db97260078ea4c263e75166f05e2cea21ccd1/content/blog/how-to-optimize-your-context-value/index.md

Be sure to measure the performance before and after with chrome dev tools and react component profilers
to make sure the changes introduced actually does make things faster... not slower.