doc: Update install doc to reflect changes in README.

Julien LepillerFri Sep 13 11:27:39+0200 2019

849e70e

doc: Update install doc to reflect changes in README. doc/install.md: Update to reflect changes in README.

doc/install.md

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This is a Guix channel. You will first need to
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[install](https://www.gnu.org/software/guix/download/) Guix itself. Then, simply
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create a new `~/.config/guix/guix/channels.scm` file with this content:
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create a new `~/.config/guix/channels.scm` file with this content:
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```scheme
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(cons* (channel
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        (name 'guix-home-manager)
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        (url "https://framagit.org/tyreunom/guix-home-manager.git")
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        (url "https://framagit.org/tyreunom/guix-home-manager.git"))
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       %default-channels)
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```
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…
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argument, whereas the first can take as many channels as you'd like before
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%default-channels.
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### Important checks ###
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Make sure your guix environment is set up properly. You need to have
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`~/.config/guix/current` as the **first** item in your `$PATH` or you're going
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to run into troubles. Additionnaly, after running `guix pull`, make sure you
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run `hash guix` in any open terminal to make sure bash's cache is cleared of
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the old guix binary location.
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Usage
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-----
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