Card: fine tuning

[ivopisarovic]

1. Card docs do not include events. I guess some events are emited when clicking on buttons.
2. Icons are not working in docs (not only for Card, but in multiple components).
3. Use better text examples or color, because "Unsaved progress" is rather a dialog than card, and also such dialog should not be in green (green is for success, not for warning).

[ivopisarovic]

@todosijeviclena

1. Please, add a separate chapter and table with events to your components' docs.
2. Still not working. I guess the path should be only /icon.png, without "/public". Test it by running "npm run build" and "npm run preview" locally.
3. Nice work!