Updates and fixes the "Adding A Content View" lesson in "Getting Started" tutorial
Updates the code, the accompanying text, and images in both light and dark variants in the "Adding A Content View" lesson of "Getting Started" tutorial.
This is cherry-picked form !135 (closed) and updated, and can be merged right away. I've tested each step in the tutorial, in each language — it works.
Edited by Maksym Hazevych