Welcome Screen link does not lead anywhere

### What Happened?

The “welcome screen” link(s) on https://github.com/elementary/hig/blob/master/user-workflow/first-launch-experience.md do not lead anywhere.

### Steps to Reproduce

Click on the link.

### Expected Behavior

It should lead somewhere that tells you what’s expected of a welcome screen.

### OS Version

6.x (Odin)

### Software Version

Latest release (I have run all updates)

### Log Output

```shell
n/a
```

### Hardware Info

n/a