Right side of activities: Proportions and alignment of canvas, title, sub title, Jiggling and Continue button

Hi @corinnewo @MendyBerger
A few actions are needed on that area:

1. Add a subtitle with the name of the use case under the main title:
   https://zpl.io/bPNR01m
2. Make the margins according to the Zeplin for the 1920 screen size
3. Make sure that the title and the subtitle are close to each other and aligned left to the canvas.
4. Make sure that the Continue button is close to the canvas and aligned right to it.
5. On Memory game when there is a "Add pair" button (Change to "Add a pair"), Make sure that the button is near the canvas and aligned to it. From content point of view the canvas+buttons are one unit, and the title and subtitle are another unit. https://zpl.io/bANDrw8
6. On smaller screen size the Jiggling and the preview button should be smaller. Our goal is that the canvas will be as large as possible as long as the Continue button is above the fold.
7. Add to the canvas the round corners and the shade following the specs on Zeplin.