Remove unnecessary code from wpc-nix.el

TL;DR:
- Prefer `(getenv "BRIEFCASE")` to `(f-expand "~/briefcase")`. I should audit my
  Emacs for references to ~/briefcase and replace those calls with `getenv`.
- Remove calls setting <nixpkgs> and <depot> and rely exclusively on <briefcase>
- Prefer ~/nixpkgs-channels to ~/nixpkgs.

Notes:
- I need a better way of calling `home-manager switch` that resides within my
  briefcase

0 files changed, 0 insertions, 0 deletions