Release a first Jessie-based beta

It seems that we’re very close to being able to release Tails 2.0~beta1: there’s very little things left to do for 2.0 AFAIK. Let’s discover remaining issues ASAP by giving it more exposure to testing.

Feature Branch: doc/10583-release-2.0-beta1

Related issues

Blocks #9012 (closed)

Original created by @intrigeri on 10583 (Redmine)

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