convert website from hugo to gatsby (#1369)

website/content/docs/widgets/date.md

@@ -0,0 +1,22 @@
+---
+label: "Date"
+target: date
+---
+
+The date widget translates a date picker input to a date string. For saving date and time together, use the datetime widget.
+
+- **Name:** `date`
+- **UI:** date picker
+- **Data type:** Moment.js-formatted date string
+- **Options:**
+  - `default`: accepts a date string, or an empty string to accept blank input; otherwise defaults to current date
+  - `format`: optional; accepts Moment.js [tokens](https://momentjs.com/docs/#/parsing/string-format/); defaults to raw Date object (if supported by output format)
+- **Example:**
+
+  ```yaml
+  - label: "Birthdate"
+    name: "birthdate"
+    widget: "date"
+    default: ""
+    format: "MMM Do YY"
+  ```