Product page template header missing if you want to remove the product page link

[SecondSkoll]

    # TODO: If there's no such website,
    #       remove the {{ product_page }} link from the page header template
    #       (usually .sphinx/_templates/header.html; also, see README.rst).

Template no longer exists locally within the project and is now up streamed into the canonical-sphinx repository. Requires a fix upstream.