[latex] Add old flake

latex/flake.nix

@@ -0,0 +1,23 @@
+{
+  description = "LaTeX Flake";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = { self, nixpkgs, flake-utils}:
+    flake-utils.lib.eachDefaultSystem
+    (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+        };
+      in {
+        devShells.default = pkgs.mkShell {
+          packages = with pkgs; [ 
+            texlive.combined.scheme-small
+            pgfplots
+          ];
+        };
+      }
+    );
+}