Refactor 4

[michaeltintiuc]

This is the fourth step of refactoring:

• We've moved the player health UI component outside of the Player component

The player's health was moved to global context as it's being used by multiple components, it will be further refactored in the future PRs. We've also created a separate component to render the player's health rather than having it in the player component. We've also updated our custom hooks so that we could position our sprites with CSS rather than DOM attributes.