This can happen if you click a link for a service you don’t have access
to. We shouldn’t show the back to service link in this case because:
- you shouldn’t be able to find out the service’s name from just knowing
the link
- if you click the link you only get a `403` anyway
When you’re not signed in you can still have a service in your session.
But there’s no point trying to get to its dashboard until you’re signed
in – you’ll just be sent back to the ‘sign in’ page.
When we moved the ‘Switch service’ link out of the nav on non-service
pages it removed any obvious way of getting back to your service on a
page that doesn’t have the service navigation (the non-obvious way is to
click ‘GOV.UK Notify’ in the black bar).
So this commit adds a ‘Back to service’ link which does the same thing
as clicking ‘GOV.UK Notify’ (tries to send you to your last-used
service, sends you to the list of services if it can’t).
Assistive technologies use the `<main>` element to navigate around a document.
In `<main>` their users expect to find:
> [content] unique to the document, excluding any content that is
> repeated across a set of documents such as sidebars, navigation links,
> copyright information, site logos, and search forms…
— https://developer.mozilla.org/en/docs/Web/HTML/Element/main
Previously, the `<main>` element also wrapped the sidebar navigation. This
commit moves the `<main>` element to only wrap the content of the page when the
page has a navigation sidebar.
This commit also removes the `page-container` class which wasn’t being used for
anything.
Banners should always be the first thing on the page.
Because headers already have padding we don’t want to put padding on the
container.
So banners should also have top padding to distance then from the red bar.
They should also sit in the 3/4 column if the page has side navigation. This
commit adds a new template (`withoutnav_template.html`) which extends
`admin_template.html`. All views then extend one or the other, never the
`admin_template.html` directly. This means that `admin_template.html` doesn’t
have to make decisions about where the flash messages are displayed.
