Incorrect target url used for brand icon in docs website navbar

Taken from ```https://docs.vapor.cloud/toolbox/install/```

```
<a href="http://0.0.0.0:8080/" title="Vapor Cloud Docs" class="md-header-nav__button md-logo">
          
            <img src="../../images/white-cloud-icon.svg" width="24" height="24">
          
        </a>
```