Remove Nix files.

I am no longer using Nix for managing user packages, and I have no
interest in actually maintaining these files.

* git-email.texi (Installation): Remove Nix installation instructions.
* default.nix, flake.lock, flake.nix: Remove files.

Signed-off-by: Xinglu Chen <public@yoctocell.xyz>

1 files changed, 0 insertions, 17 deletions

diff --git a/flake.nix b/flake.nix
deleted file mode 100644
index 06e5edc..0000000
--- a/flake.nix
+++ /dev/null
@@ -1,17 +0,0 @@
-{
-  description = "git-email.el flake";
-
-  inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
-    flake-utils.url = "github:numtide/flake-utils";
-  };
-
-  outputs = { self, nixpkgs, flake-utils }:
-    flake-utils.lib.eachDefaultSystem (system:
-      let pkgs = nixpkgs.legacyPackages.${system};
-      in
-      rec {
-        packages = pkgs.lib.recurseIntoAttrs (pkgs.callPackage ./. {});
-        defaultPackage = packages.git-email-full-git;
-      });
-}