♻️ Refactor Javascript Into Layerd Architecture

[connormaglynn]

👀 Purpose

• To refactor code into smaller modules to minimise the chance of introducing bugs by reducing duplication and separation of concerns

♻️ What's changed

• Added several new files to separate the layers of the code, starting from the top:
  • Handlers - to handle events and route logic
  • Services and Views - to process data and display the UI
  • Repositories - For interacting with the persistence layer

📝 Notes

• More layers and modules may be added in the future, such as a Client layer for interacting with external APIs such as the PinnedTabsClient etc.
• No functional changes have been made