Document the installation of the 2e fix from SD card
## Summary
<Summarize the improvement briefly and precisely>
Create a step by step guide explaining how to install an update from the SD card.
## Description
@nothingtohide we are planning to send SD cards to ~2e impacted users blocked on /e/OS 1.0.
As most of these users are not tech-savvy, we will send/share a step-by-step guide with clear instructions on how to apply the update from an SD card as seen here https://gitlab.e.foundation/e/backlog/-/issues/6083#note_288763).
The documentation needs to include all button presses, waiting time, what is seen on screen, etc...
In case you have questions, you can connect with @dj about the steps.
/cc @teams/support-team @rhunault @nicofonk
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