Pass hostname to all html templates

[armandocerna]

We would like our html templates to reflect the hostname override we are passing to golink, these changes pass the hostname to all HTML templates

[willnorris]

rather than passing the hostname in as a variable, how about registering a function that can be used in all of the templates? It feels a tiny bit wrong to use "go" as the func name, since it's already a keyword, but it works pretty well since it's not actually a registered template func. So something like:

	tmplFuncs := template.FuncMap{
		"go": func() string {
			return *hostname
		},
	}

which is registered on all of the templates, and then inside the template files themselves, we can use {{go}}, which is still quite readable. I've got the start of this working if you're okay with me pushing it to your branch?

[armandocerna]

Much cleaner, I like it! Totally ok with you pushing to my branch.

[armandocerna]

I saw you were curious, very simple change we use so for the hostname we have an internal cli utility named the same