Revert create screen and improve details usability

Remove disabled mouse pointer on read-only detail fields.
Make initial assessments list view more friendly.
Rename assessments details action to edit
Remove meaningless homepage and replace with assessments home page
Move assessment list view menu to top bar

Tweak homepage first use instructions.
Add containers in index view to add spacing.
Add cancel button and autofocus to the create view.
Open assessments in new windows
Add new name validation and other improvements

Validate that both names are entered, highlight missing field if not.
Update model to move the new row as a separate property.
Add "add new candidate" button.
Minor assessment edit view styling tweaks