Update Iosevka build plan

pkgs/default.nix

@@ -4,16 +4,22 @@ self: super:
 
 {
   qutebrowserWE = super.qutebrowser.override { withWebEngineDefault = true; };
-  iosevka-hskl = let
-    tags = [
-      "ss08" # Use Pragmata Pro Style
-      "term" # Disable ligature/ligation
-    ];
-  in
-    super.iosevka.override {
-      design = tags;
-      set = "PPStyle";
+
+  super.iosevka.override {
+    privateBuildPlan = {
+      family = "Iosevka Samae";
+      design = [
+        "ss08" # Use Pragmata Pro Style
+        "term" # Disable ligature/ligation
+      ];
+      slants = {
+        upright = "normal";
+        italic = "italic";
+        oblique = "oblique";
+      };
     };
+    set = "Samae";
+  };
 
   wineNoGS = super.wineStaging.override { gstreamerSupport = false; };
 
@@ -36,8 +42,6 @@ self: super:
     stdenv = super.overrideCC super.stdenv super.gcc6;
   };
 
-  minitube = super.libsForQt5.callPackage ./minitube {};
-
   # Originally from Mats Rauhala ®2018
   copy = super.writeScriptBin "copy" ''
     function clean() {