[completion] Completion scripts not loaded from ~/.guix-profile/etc/profile

[YOANN P]

Hi guix,

Not sure if it needs to be add to the guix documentation or directly included 
in "~/.guix-profile/etc/profile" generation process, 
but the completion scripts provided by packages seem not to be loaded.
For example, if i only install the package "git", the completion scripts for 
"git" reside in "~/.guix-profile/etc/bash_completion.d/git".
But there is no loading instructions for those files in 
"~/.guix-profile/etc/profile".
So after sourcing "~/.guix-profile/etc/profile", a user need to loop over files 
in "~/.guix-profile/etc/bash_completion.d/" 
and "~/.guix-profile/share/bash-completion" to source them manually because 
native bash/bash-completion from the user distribution 
are not aware of the new completion scripts available in 
"~/.guix-profile/etc/bash_completion.d/" and  
"~/.guix-profile/share/bash-completion".

I think a "bash loop" need to be added for this purpose in the generation of 
"~/.guix-profile/etc/profile" and in the meantime add a section for this
inside "2.6 Application Setup" section be cause i didn't find any instructions 
about this on the documentation.

Regards,
Yoann