-The context is referenced for authenticated user information, as well as messaging.
-
-- `ctx.session.authenticatedIdentifier`
-- `ctx.session.authenticatedProfile`
-
-If either of these are present, a navigation link is added to the page header allowing the user to log out.
-The link will point relatively to `/admin/logout`.
-
-- `ctx.url`
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-If present, added as a query parameter (`r`, for redirect) to the logout link.
-