Document how to bind Ctrl keys in neomutt config

[matthiasbeyer]

Description

I stumbled over this, and figured I add some documentation about how to do it.

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• Change is backwards compatible.

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Maintainer CC

@gbirke @Cybolic

[teto]

I would have thought the backslash \ would appear if it were escaping nothing ? could only find https://nixos.org/guides/nix-pills/04-basics-of-language#strings
but it behaves like you say.

nix-repl> builtins.trace "\Ctoto" {}
trace: Ctoto
{ }