kibi: enable syntax highlighting

pkgs/applications/editors/kibi/default.nix

···
 { lib
 , fetchFromGitHub
 , rustPlatform
+, makeWrapper
 }:
 
 rustPlatform.buildRustPackage rec {
···
     rev = "v${version}";
     sha256 = "sha256-ox1qKWxJlUIFzEqeyzG2kqZix3AHnOKFrlpf6O5QM+k=";
   };
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  postInstall = ''
+    install -Dm644 syntax.d/* -t $out/share/kibi/syntax.d
+    wrapProgram $out/bin/kibi --prefix XDG_DATA_DIRS : "$out/share"
+  '';
 
   meta = with lib; {
     description = "A text editor in ≤1024 lines of code, written in Rust";