This commit moves user-related navigation into the proposition header (the black
bar) at the top of the site. It adds some custom SASS to override GOV.UK
template and align these navigation items to the right (because it looks
better).
It then removes the service chooser dropdown (and its associated SASS and JS) in
favour of a link alongside the user-related navigation items. ‘Switch service’
is the best language for this that we’ve come up with so far.
This means that the only way of adding a new service is from the `/services`
page. So this commit removes the redirect if you land on this page with only one
service (else it would prevent you from ever being able to add more).
Because a user can have multiple services, they need a way to navigate between
them. Normally they can use the ▶ Switcher to do this, except when:
- they first sign in
- they are on a page which isn’t associated with a service (eg user profile) in
which case we can’t use the switcher because it won’t know what the ‘current’
service is
So this commit adds a new page with a (fake) list of services.
