Documentation: Add Montevina ThinkPads common page

- Add a common page about Montevina ThinkPads.
- Describe how to disable ME and remove its firmware on these models.
- Describe vendor flash layouts.

Thanks to swiftgeek for his help when writing this, especially the last
paragraph and flash layouts.

Change-Id: I85917821efe63fff4b933b6226e99c17b63eb1b9
Signed-off-by: Evgeny Zinoviev <me@ch1p.io>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38926
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

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