Move edit options to page body

This is a proposal to move the edit options out of the administration block and into a dropdown (action menu) in the page body.

This includes:

1. Edit this chapter
2. Delete this chapter

We still need to consider how the following can be managed:

1. Add a new chapter after this one
2. Move up
3. Move down

This is to try and reduce the clutter in the Table of content when editing is turned on