Follow-up from "Docs/devops gamedev gitlab"

The following discussions from !13255 (merged) should be addressed:

@marcia started a discussion: (+1 comment)

This is clearly the end of a section, so maybe we should add a header here. Or just a paragraph introducing your game: what it is and what it does. Something like:

The game

Our game consists of a simple spaceship traveling in space that shoots by clicking the mouse in a given direction.
@rebecca started a discussion:

...furthermore, **by** using GitLab...
@rebecca started a discussion:

I would introduce your game title here: "Our game, Dark Nova, consists..."

=> Marcia: does not apply, as the demo game is not Dark Nova, but this one here: http://gitlab-game-demo.s3-website-us-east-1.amazonaws.com/. I changed it to make it clearer.
@rebecca started a discussion:

Lower case s on setup
@rebecca started a discussion:

"We'll add two classes to it: ..."
@rebecca started a discussion:

Lower case u on up
@rebecca started a discussion:

"Set up" (two words)
@rebecca started a discussion:

"Set up" (two words)

Edited Mar 06, 2018 by Marcia Ramos

The game