Draft: Refactor pages

I think this is a more robust way to handle pages - rather than have an array of pages in two places. This also means that the order of all pages is made clear too.

Marked as a draft because I'd like to clear up why network is not visible by default, and the purpose of later making it visible.

Is this done to avoid QML working out the layout (🤷) until it's known that network will be included as a page? Does making it visible after force this?