feat: add support for namespaces in the HTML template

[bshaffer]

We would like to display the namespace somewhere in the HTML, and this is even more important now that we have released new service clients which have the same name as the old service clients.

This could be as simple as outputing the namespace in a div above the title:

This was added with the following HTML:

<div>Google \ Cloud \ AutoMl \ Client \ <a href="#">AutoMlClient</a></div>