feat: adds wikit to overlay

pkgs/default.nix

@@ -1,12 +1,4 @@
-rec{
-  overlay = final: prev:
-    let
-      dirContents = builtins.readDir ../pkgs;
-      genPackage = name: {
-        inherit name;
-        value = final.callPackage (../pkgs + "/${name}") { };
-      };
-      names = builtins.attrNames dirContents;
-    in
-    builtins.listToAttrs (map genPackage names);
+{ pkgs } :
+{
+  wikit = pkgs.callPackage ./wikit/default.nix { };
 }

pkgs/wikit/default.nix

@@ -0,0 +1,16 @@
+{ lib, ... }:
+with lib;
+let
+  src = fetchFromGitHub {
+    owner = "owner";
+    repo = "repo";
+    rev = "";
+  };
+in {
+  wikit = mkYarnPackage {
+    name = "wikit";
+    inherit src;
+    packageJSON = src + "./package.json";
+    yarnLock = src + "./yarn.lock";
+  };
+}