Path to teaching-tomster.png in css

Hi, just a small thing, going through the tutorial this morning - the image wasn't working for me (or doesn't appear in the screenshots either), but if I adjust asset path to navigate two levels up instead of one in the CSS at bottom of this page, then the image appears on the page

Down the bottom here https://guides.emberjs.com/release/tutorial/part-1/orientation/

e.g

```css
.tomster {
background: url("../../assets/images/teaching-tomster.png");
}
```

Open the tutorial orientation page and inspect the CSS at the bottom where the .tomster background image is defined. Check the relative path to teaching-tomster.png, then verify that the image appears on the page and matches the tutorial screenshots.

Written by the indexing model from the issue text.