convert website from hugo to gatsby (#1369)

website/content/docs/widgets/hidden.md

@@ -0,0 +1,17 @@
+---
+label: "Hidden"
+target: hidden
+---
+
+Hidden widgets do not display in the UI. In folder collections that allow users to create new items, you will often want to set a default for hidden fields, so they will be set without requiring an input.
+
+- **Name:** `hidden`
+- **UI:** none
+- **Data type:** any valid data type
+- **Options:** 
+  - `default`: accepts any valid data type; recommended for collections that allow adding new items
+- **Example:**
+
+  ```yaml
+  - {label: "Layout", name: "layout", widget: "hidden", default: "blog"}
+  ```