Add article about erasing data securely

[ghost]

Add an article about how to erase data securely.

Resolves: #1120

[github-actions]

🎊 PR Preview 9323ca3 has been successfully built and deployed to https://privacyguides-privacyguides-org-preview-pr-1256.surge.sh

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[dngray]

I think for this one there are two main tools to suggest. nwipe for magnetic disks, and Secure ATA erase.

The second one might would be cool if we could show some screenshots from a BIOS menu as an example.

[d4rklynk]

There is the shred command in Linux for HDD

[dngray]

There is the shred command in Linux for HDD

The only thing that should be mentioned is that shred does not work very wall/at all for journaled/CoW filesystems, see https://en.wikipedia.org/wiki/Shred_(Unix)#Limitations

[subatomic-honda-civic]

I think for this one there are two main tools to suggest. nwipe for magnetic disks, and Secure ATA erase.

Maybe it would be useful include the Secure ATA erase article, since there's lot's of very important red warnings and disclaimers, or you can add that into the site itself.

Also there's different stuff for NVMe drives: https://wiki.archlinux.org/title/Solid_state_drive/Memory_cell_clearing#NVMe_drive (Pretty much the only article I can find)

[dngray]

I removed the thing about SLC drives, and just referred to that as "caching" because it isn't the only kind of caching that exists.

Additionally most consumer drives are TLC/MLC/QLC type anyway.

[blacklight447]

Looks great.