nix: flatten homeModule implementation

nix/homeModules/extra/feh.nix

@@ -0,0 +1,27 @@
+{
+
+  programs.feh = {
+    enable = true;
+    keybindings = {
+      prev_img = [
+        "Left"
+        "Up"
+      ];
+      next_img = [
+        "Right"
+        "Down"
+      ];
+
+      scroll_left = "h";
+      scroll_right = "l";
+      scroll_up = "k";
+      scroll_down = "j";
+
+      # mimic sioyek
+      zoom_in = "plus";
+      zoom_out = "minus";
+      zoom_fit = "=";
+    };
+  };
+
+}