[emacs] disable borg-nix-shell for now

[~bandali/configs] / lib / borg-nix-shell

diff --git a/lib/borg-nix-shell b/lib/borg-nix-shell
deleted file mode 160000 (submodule)
index 84dac9e..0000000
--- a/lib/borg-nix-shell
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 84dac9e821ea445a6b4542d021d3094b0c1e55d3