build: migrate from Make to Zig build system + Just

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I7585121a5ec8e797adc43ba8e30d4ac86a6a6964

nix/shell.nix

@@ -2,9 +2,10 @@
   mkShell,
   clang-tools,
   raylib,
-  gnumake,
   pkg-config,
+  just,
   zig,
+  zig-zlint,
 }:
 mkShell {
   strictDeps = true;
@@ -14,7 +15,9 @@ mkShell {
   nativeBuildInputs = [
     pkg-config
     clang-tools
-    gnumake
+    just
+
     zig
+    zig-zlint
   ];
 }