it can be changed by specifying it when creating the "page" component, or maybe in a prerender/onnav (or both).
Structure will be:
Generic page component IS IMPLEMENTED BY "specific page" WHERE OnNav/OnPreRender specify its details WHICH IS CREATED with its own "newXPage()" function. See https://github.com/maxence-charriere/go-app/blob/master/docs/src/actions-page.go for example.
- "main content" is an array of app.UI elements.
This can also be further abstracted using "block" components (the ones with the cool color)
- THOSE BLOCK COMPONENTS' CONTENT can be set manually on creation, OR by passing HTML/MarkDown (not decided yet)