convert website from hugo to gatsby (#1369)

website/content/docs/widgets/datetime.md

@@ -0,0 +1,22 @@
+---
+label: "DateTime"
+target: datetime
+---
+
+The datetime widget translates a datetime picker to a datetime string. For saving the date only, use the date widget.
+
+- **Name:** `datetime`
+- **UI:** datetime picker
+- **Data type:** Moment.js-formatted datetime string
+- **Options:**
+  - `default`: accepts a datetime string, or an empty string to accept blank input; otherwise defaults to current datetime
+  - `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: "Start time"
+    name: "start"
+    widget: "datetime"
+    default: ""
+    format: "LLL"
+  ```