Document that ScrambleSuit bridges are supported

We are going to install obfs4proxy 0.0.4 in Tails 1.3.2, which adds scrambesuite support.

Feature Branch: bitingbird:doc/9132-scramblesuit

Original created by @anonym on 9132 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information