Route Cancel / Back Button

[Seiyaroo]

As a developer, I will want to be able to go backwards from an existing page. While most phones have a "back" feature built in by swiping, we want to enable ease of use for users who may not be as technologically inclined. Back buttons are recognizable and consistent no matter the native tongue of a user. In addition we want our app to be consistent so something like an app bar could be useful in our design.

Describe the solution you'd like
I would like a back button that appears in a consistent way across pages as it is needed. This in particular will be useful on the page where you can edit events.

Tutorials:
scaffold: https://developer.android.com/jetpack/compose/components/scaffold
app bars: https://developer.android.com/jetpack/compose/components/app-bars

relates to USER STORY #58