doc: Update installation instructions.

Julien LepillerSat Jul 25 23:48:29+0200 2020

81866a2

doc: Update installation instructions. * README.md: Mention creating temporary symlinks in the installation intructions. * doc/install.md: idem.

README.md

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source $GUIX_PROFILE/etc/profile`.  You might also need to run `hash -r`
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(no output) for bash to clear all its memorized binary locations.
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Finally, create a temporary symbolic link that helps guix find some required
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directory (it would otherwise run in a loop trying to create the missing
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directories):
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```bash
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ln -sv /data/alice /var/guix/profiles/per-user/alice/home
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# Before running, ensure $HOME does not exist yet.  After this command, it
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# should be a symlink.
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ln -sv /var/guix/profiles/per-user/alice/home $HOME
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```
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### Creating the first home generation
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To create your first home configuration, you must create a configuration file.
doc/install.md
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source $GUIX_PROFILE/etc/profile`.  You might also need to run `hash -r`
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(no output) for bash to clear all its memorized binary locations.
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Finally, create a temporary symbolic link that helps guix find some required
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directory (it would otherwise run in a loop trying to create the missing
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directories):
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```bash
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ln -sv /data/alice /var/guix/profiles/per-user/alice/home
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# Before running, ensure $HOME does not exist yet.  After this command, it
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# should be a symlink.
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ln -sv /var/guix/profiles/per-user/alice/home $HOME
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```
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### Creating the first home generation
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To create your first home configuration, you must create a configuration file.