Adapt Tails Installer packaging to its rename
This includes updating the release doc accordingly (since it was originally part of #8555 (closed), which was mark as resolved before this was done).
Feature Branch: 451f:tails/jessie
Parent Task: #8549 (closed)
Related issues
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Blocked by #8552 (closed) - Blocks #8557 (closed)
Original created by @intrigeri on 8553 (Redmine)