Elektra: elektra-web use cases

Elektra 0.8.24

elektra-web use cases

The path through the use cases is as follows:

- Setup instance
- View config

Now we are in the main part of the application, and we can do the following use cases:

- Adding keys
- Modifying keys
- Drag & Drop keys
- Finding keys

Any of these use cases (except for finding because no change is made), are extended by the Key validation use case. After doing any of these use cases, we can do the Undo/Redo use case to revert them.