Update todo.
Add overridable blocks for this

Signed-off-by: Chris Lamb <chris@chris-lamb.co.uk>
Set active class for classical.

Signed-off-by: Chris Lamb <chris@chris-lamb.co.uk>
Navbar.

Signed-off-by: Chris Lamb <chris@chris-lamb.co.uk>
Add a books base, etc.

Signed-off-by: Chris Lamb <chris@chris-lamb.co.uk>
Unfiled too (untested)

Signed-off-by: Chris Lamb <chris@chris-lamb.co.uk>
Drop books.admin.
Support merging authors.

Signed-off-by: Chris Lamb <chris@chris-lamb.co.uk>