Adapt our documentation to the deprecation of SD cards

Originally created by @sajolida on #9965 (Redmine)

See https://mailman.boum.org/pipermail/tails-ux/2015-August/000535.html

Feature Branch: doc/9965

Subtasks

#9790 (closed)

Related issues

Related to #9884 (closed)
Blocks #13423 (closed)

Edited May 15, 2020 by sajolida

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