Drop disk encryption
This pull request removes Disk Encryption section. Reasons:
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Disk encryption software is tightly coupled to operating system. Currently, all software that we list in that category maps to specific corresponding operating system.
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It's actively bad advice to recommend Windows/macOS users to avoid using BitLocker/FileVault respectively: some/questionable disk encryption is better than none.
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Disk encryption is something that is usually so deeply integrated into operating system that we can't recommend any reasonable alternatives for Windows or macOS.
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At-rest disk encryption and surveillance are orthogonal to each other.