chore: moved packages from the exported package set to overlays under ./package.nix

overlays/imx471/default.nix

@@ -1,5 +1,5 @@
 {...}: final: prev: {
   linuxPackages_latest = prev.linuxPackages_latest.extend (self: super: {
-    imx471 = self.callPackage ../../packages/imx471/default.nix {};
+    imx471 = self.callPackage ./package.nix {};
   });
 }

overlays/miasma/default.nix

@@ -1,3 +1,3 @@
 {...}: final: prev: {
-  miasma = final.callPackage ../../packages/miasma/default.nix {};
+  miasma = final.callPackage ./package.nix {};
 }