feat: rewrite to more nixy flakes

pkgs/tetrio/leveldb.nix

@@ -1,31 +1,32 @@
 {
-    pkgs ? import <nixpkgs> { },
-    mpkgs ? import /etc/nixos/pkgs/default.nix { },
+    stdenv,
+    lib,
+    leveldb-cli,
+    value,
     origin ? "https://tetr.io",
     key ? "userConfig",
-    value,
-	...
+    ...
 }:
 
 let
     src = ./.;
 in
-pkgs.stdenv.mkDerivation {
+stdenv.mkDerivation {
     pname = "tetrio-leveldb";
     version = "1";
 
     inherit src;
 
-    nativeBuildInputs = [ mpkgs.leveldb-cli ];
+    nativeBuildInputs = [ leveldb-cli ];
 
     buildPhase = ''
                 runHook preBuild
 
-                ${pkgs.lib.getExe mpkgs.leveldb-cli} \
+                ${lib.getExe leveldb-cli} \
         			$out \
-        			${pkgs.lib.escapeShellArg origin} \
-        			${pkgs.lib.escapeShellArg key} \
-        			${pkgs.lib.escapeShellArg (builtins.toJSON value)}
+        			${lib.escapeShellArg origin} \
+        			${lib.escapeShellArg key} \
+        			${lib.escapeShellArg (builtins.toJSON value)}
 
                 runHook postBuild
     '';