refactor: move actual budget package to flake

# changes:
## Nixpkgs
- move actual budget package to flake
## Yazi
- Fix some keymap

pkgs/fonts/dfkai-sb/default.nix

@@ -0,0 +1,22 @@
+{
+  src,
+  stdenvNoCC,
+  ...
+}:
+stdenvNoCC.mkDerivation {
+  inherit src;
+
+  dontUnpack = true;
+  dontBuild = true;
+
+  pname = "dfkai-sb";
+  version = "1.0.0";
+
+  installPhase = ''
+    runHook preInstall
+
+    install -Dm 644 $src -t $out/share/fonts/truetype
+
+    runHook postInstall
+  '';
+}