Dear Maintainer,

By default, the /usr/bin/guix binary is always used. It is perfect for easy
bootstrapping. Nevertheless it is problematic for users that do not understand
guix behavior well. Any "guix pull" will start from the guix state at debian
build time, with, e.g., an outdated package list (at 2024-01-30: debian guix:
21K package, locally build guix: 28K package, debian guix: emacs 28.2, locally
build guix: emacs 29.1, ...) and long compilation.

Thus, after "guix pull" most users should used the newly build guix binary.
Nevertheless it is quite easy to ignore the related message and to not
understand why it is useful, or to mix it with the "guix install" messages.

I would had at the end of the README.Debian a small explanation. May be
something short like:

"""
Each user first "guix pull" command will build a new guix binary including the
current, at build time, dependence tree. Most user should probably use this new
guix binary thereafter. The "guix pull" command will display at its end the few
command lines that should be inserted in their bashrc/zshrc/... to change their
PATH.
Typically:
GUIX_PROFILE="/home/johndoe/.config/guix/current"
. "$GUIX_PROFILE/etc/profile"

The previous addition to the PATH is different and complementary to the end of
"guix install" command lines.
Typically:
GUIX_PROFILE="/home/johndoe/.guix-profile"
. "$GUIX_PROFILE/etc/profile"