Rework command lines on expert scenario
_Originally created by @sajolida on [#10621 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/10621)_
- Rework all command lines \[32\]
- One liner
- Simplier versions
- Expected output
- Verbose
- Use local signature by default \[44\]
- Explain that unverified signatures are fine
Feature Branch: web/10621-expert-command-lines
Parent Task: tails/tails#8592
### Related issues
- [x] **Blocked by** tails/tails#8557
- [x] **Blocked by** tails/tails#8805
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