Refer to the main domain from a subdomain

1

I would like to refer to the main domain from a subdomain. The subdomain is hello.example.com and is reached with {{ .URL }}. In the config.toml stands
baseURL = "http://hello.example.com"

I would like to refer to http://example.com.
<a class="brand" href="http://example.com/"> Hello </a>

2

Not out of the box.

You could create a parameter in your config with the top level domain and reference that in your templates.