docs: add code widget docs (#3023)

website/content/docs/widgets/code.md

@@ -0,0 +1,22 @@
+---
+title: code
+label: 'Code'
+---
+
+The code widget provides a code editor (powered by [Codemirror](https://codemirror.net)) with optional syntax awareness. Can output the raw code value or an object with the selected language and the raw code value.
+
+- **Name:** `code`
+- **UI:** code editor
+- **Data type:** string
+- **Options:**
+  - `default_language`: optional; default language to use
+  - `allow_language_selection`: optional; defaults to `false`: allows syntax to be changed
+  - `keys`: optional; sets key names for code and lang if outputting an object; defaults to `{ code: 'code', lang: 'lang' }`
+  - `output_code_only`: set to `true` to output the string value only, defaults to `false`
+
+- **Example:**
+  ```yaml
+  - label: 'Code'
+    name: 'code'
+    widget: 'code'
+  ```