This reverts commit 61fd61f4.

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Document why some major Tails features are not packaged for Debian

Closes #6944

See merge request !35

Update sysadmins OpenPGP key due to expiry

See merge request !45

GitLab: document gitlab-config repo and what it's useful for

Closes #17753

See merge request !40

I'm under the impression that nobody felt like doing that recently,
so I won't bother porting this to GitLab.

This does not seem to be the correct issue ID. I suspect a copy'n'paste
error.

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This list has been unmaintained since it was added in 2015, this info has been
outdated for years, so it's more misleading than beneficial.

Let's instead document current working mechanisms to get input
in the code, documentation, and UX areas.