Notify the user when their 32-bit computer won't work with Tails 3.0
_Originally created by @intrigeri on [#12193 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/12193)_
Let’s make this notification point to the blog post that will result
from tails/tails#12192.
This branch shall be reverted on feature/stretch, where its only effect
would be to eat memory and CPU cycles.
Feature Branch: feature/12193-notify-if-32-bit
Parent Task: tails/tails#12163
### Related issues
- **Related to** tails/tails#12281
- [x] **Blocked by** tails/tails#12192
- [x] **Blocked by** tails/tails#12269
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