[PATCH] Remove Emacs interface.

[Alex Kost]

The attached patch removes Emacs UI and its documentation (12000 lines
removed, hooray!).  I added the only mention about 'emacs-guix' package
in "Package Management" chapter.

Now 'emacs' directory contains a single git-controlled file -
"guix-emacs.el".  It is used to patch our 'emacs' package (to find emacs
packages in "share/emacs/site-lisp/guix.d").  But it is misplaced.

What about making "gnu/packages/files" (or another dirname) directory,
and putting "guix-emacs.el" and kernel configs ("linux-libre-*.conf")
there?

I mean "gnu/packages/patches" is not always enough, sometimes we want to
use real files in the package recipes (configs for 'linux-libre' or
"guix-emacs.el" for 'emacs'), so having "gnu/packages/files" seems
reasonable to me, WDYT?

0001-Remove-Emacs-interface.patch
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