Resolve "LTI Setup page"

Summary

A simple GUI for setting up LeAn from the Frontend.

Closes #83 (closed)

Changes

Inside Public/

feature: ✨ LTI creation (proxy) for setup page

Inside Frontend/

feature: ✨ Setup page on the homepage of LeAn refactoring: ♻️ Routes now lazily load one another

Breaking changes

Before merge

• Changed code has been reviewed
• Tested to build, start and is usable