Bug 1829940: Restrict the chooser to one 'add' button
Done in this patch:
- restricted the list to one shortcut button (the placeholder one)
- cleaned up old code where one could edit the block on the without
modal
- moved the button to be above content layout and next to the
instructions section
- move the block help link to within placeholder block and be an 'i'
on 'Content types' heading
behatnotneeded
Change-Id: I8a85842ffef5e50c62aca73a4b33c22579b160ca
Signed-off-by:
Robert Lyon <robertl@catalyst.net.nz>
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