Make Page manifest customisable through YAML

[pietbrauer]

As discussed in #36 I am proposing a new layout for the chapters sections of the YAML:

Before:

chapters:
  - "Chapter 1"
  - "Chapter 2"

After:_

chapters:
  - name: "Chapter 1"
     EdgeToEdgeLiveView: true
  - name: "Chapter 2"
     EdgeToEdgeLiveView: false

A proposed implementation can be viewed in #42

[orta]

Aye, I think we'll end up needing more settings per chapter, imo though they should be lower snake case, so EdgeToEdgeLiveView = edge_to_edge_live_view

[pietbrauer]

@orta makes sense, will update #42

[pietbrauer]

Fixed via #42