Add tutorial component

[ofr1tz]

Is your feature request related to a problem? Please describe.
Currently, the instructions component ("How to contribute") offers project-type specific help on how to interact with the app. For project of type Find, the different answer options are visualized on the same arbitrary image tile (^= the upper left image tile on the current page) without providing a hint on which option might be the correct one. As a user, I would like to see examples for the different answers that are specific to the current project, to guide my contributions.

Describe the solution you'd like
Implement a tutorial component that provides hands-on project-specific tutorials, similar to the mobile app, drawing the necessary information from the same tutorial projects.

Describe alternatives you've considered
The app is currently able to link to any tutorial/additional info resources via a button titled "More info" on the instructions component, if the project entry on Firebase provides a manualUrl.

Additional context
Refers #9

[ofr1tz]

Implemented with #35 and #39