[#5909] Added /auth/prefs redirect to /auth/subscriptions

Signed-off-by: Cory Johns <johnsca@geek.net>
[#5909] Fixed user_skills redirect on add / remove

Signed-off-by: Cory Johns <johnsca@geek.net>
[#5909] Fixed URLs in auth tests

Signed-off-by: Cory Johns <johnsca@geek.net>