This adds an expandable section of the login view to allow users to
specify an auth key and an alternate control URL.
Input and Collapsible components and accompanying styles were brought
over from the adminpanel.
Updates #10261
Signed-off-by: Will Norris <will@tailscale.com>
Adds Inter font and uses it as the default for the web UI.
Creates a new /assets folder to house the /fonts, and moves /icons
to live here too.
Updates #10261
Signed-off-by: Sonia Appasamy <sonia@tailscale.com>
