refactor(emacs): use plex-latex from sydpkgs

modules/home/users/msyds/emacs/nix/plex-latex.nix

@@ -1,4 +1,4 @@
-{ config, lib, pkgs, ... }:
+{ config, lib, pkgs, inputs, ... }:
 
 let cfg = config.sydnix.users.msyds.emacs.plex-latex;
 in {
@@ -7,40 +7,9 @@ in {
   };
 
   config = lib.mkIf cfg.enable {
-    sydnix.emacs.tex.extraTexPackages =
-      let syd-plex = pkgs.stdenvNoCC.mkDerivation (final: {
-          pname = "syd-plex-latex";
-          version = "1.0.0";
-          src = ./plex-latex;
-          nativeBuildInputs = [ pkgs.texlive.combined.scheme-small ];
-          passthru = {
-            pkgs = [ final.finalPackage ];
-            tlDeps = with pkgs.texlive; [
-              plex
-              plex-otf
-              fontaxes
-              unicode-math
-              xetex
-            ];
-            tlType = "run";
-          };
-          installPhase = ''
-            runHook preInstall
-            dir="$out/tex/latex/syd-plex"
-            mkdir -p "$dir"
-            mv syd-plex.sty "$dir"
-            runHook postInstall
-          '';
-        });
-      in {
-        inherit syd-plex;
-        inherit (pkgs.texlive)
-          plex
-          plex-otf
-          fontaxes
-          unicode-math
-          xetex
-        ;
-      };
+    sydnix.sydpkgs.overlay.enable = true;
+    sydnix.emacs.tex.extraTexPackages = {
+      inherit (pkgs) syd-plex-latex;
+    };
   };
 }