Add deep linking functionality
Note that !122 (merged) is used in this MR, so it has to be reviewed first.
Adds deep linking functionality, meaning the app allows certain links to be opened in the app. These links consist of
https://thalia.nu/events/[id]/ for now. If one of these links is opened on the user's device, they get the option to open it in the app.
Steps to use this feature
- Open one of the URLs mentioned above on your phone.
- Choose to open the URL with the ThaliApp.
- Notice that the app redirects you to the correct scene.