Add Summer Reading Progress link when logged in
Add Summer Reading Progress link when logged in

Add Summer Reading Progress link to top nav when logged in.

Remove "Summer Reading" signup link to avoid running out of room in
the topnav area.

Signed-off-by: Jeff Godin <7b658ab2e5573260a7dc1c722b8df4a45dfe4eff@tadl.org>

tadl/Evergreen_templates_tadlskin