Create sub-deck workflow

Background

Need to improve and agree the process for adding slide-decks and slides. This has been highlighted as an issues as users are making errors.

Description of functionality:

You can currently add sub decks by 3 routes:

1. use the Add deck button above the slide. This work in both the View and edit mode. The new sub-deck is placed after the current slide. The user is taken to the deck edit page for the sub-deck
2. use the Append sub-deck button above the slide. This work in both the View and edit mode. The appended sub-deck is placed after the current slide. The user is taken to the deck edit page for the sub-deck
3. use the context menu in the deck-tree. This adds the sub-deck after the current slide. The user is taken to the deck edit page for the sub-deck

In addition users are not aware of where the sub-deck will be located within the deck structure. There is a task to improve the focus indicator

Action items

1. Need to agree where a user is directed after a sub-deck is added.
   Soledad Valero proposed the DeckEdit iew but the controls above the deckedit area are disabled until the user clicks save.
   Abi James the most natural view for a user is to be taken to the first slide of the sub-deck. In the future the deck-title could be editable from the Info panel.
   
   
2. Where is the user directed after adding a new slide? Should they bee taken directly to Edit mode for the slide or directed to edit the title of the slide