Creating root instance template with a render function
Instead of giving a component or an instance of Vue a template, you can just instead define
a render function and not bother with the template.
So in this video what we're going to do is our root instance of Vue rather than having
this template, which is actually just a very simple template, rather than having that we're
going to replace that with a render function.
Now why are we going to do that?
Well, the explanation is that pretty soon