Add transparency to mangohud.

nodes/hosts/common/home/jay/programs/mangohud.nix

@@ -1,4 +1,4 @@
-{ ... } : {
+{ lib, ... } : {
   programs.mangohud = {
     enable = true;
     enableSessionWide = true;
@@ -9,6 +9,8 @@
       fps = true;
       font_size = 12;
       cellpadding_y = -0.070;
+      background_alpha = lib.mkForce 0.5;
+      alpha = lib.mkForce 0.75;
     };
   };
 }