Get ready for removing tails-installer from Debian

When running outside of Tails, instead the GUI, display a dialog that points to the up-to-date installation instructions. If relevant, add a dependency on the package that includes the now-recommended software (GNOME Disks?).

Feature Branch: installer:tails/16011-deprecate-outside-of-tails

Attachments

Parent Task: #15292 (closed)

Related issues

Related to #16470 (closed)
Blocks #16012 (closed)

Original created by @u on 16011 (Redmine)

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