Idea: Install script to better support improving contributor-friendliness of projects

[Никита Чураев]

Here's how I want to use Guix and it is to increase 
contributor-friendliness of a project, so that the user can simply run a 
distribution-independent command to install all dependencies without 
having to hunt for them with `apt` and `dnf` manually.

Unfortunately, Guix itself is not very easy to install, and the 
instructions are full of rather technical stuff like 'systemd' and 
'upstart'.

https://www.gnu.org/software/guix/manual/html_node/Binary-Installation.html

There should be a script like the one Haskell Stack uses:

|curl -sSL https://get.haskellstack.org/ | sh|

IMO supporting this as a use case could really bring popularity to GNU Guix.

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