Improve story telling on each page

[kapetan3sid]

Acceptance criteria:

• For each page, have a concise "You have so far learned X You will learn in this page Y. Once done, consider learning about Z".

[kianenigma]

Fixing this in the existing pages is hard, but going into V2, shall we make this + listing references mandatory for each page?

[CrackTheCode016]

This is probably mostly relevant for tutorials, but I suspect we could sneak this into some of the conceptual pages in "Develop" too.

[kianenigma]

Ack, it is mainly relevant for a tutorial.