fix: id not coming through to final json

Author: moT01

src/schema/tutorial.ts

@@ -316,5 +316,5 @@ export default {
     },
   },
   additionalProperties: false,
-  required: ["version", "summary", "config", "levels"],
+  required: ["id", "version", "summary", "config", "levels"],
 };

src/utils/parse.ts

@@ -144,6 +144,7 @@ export function parse (params: ParseParams): any {
   const mdContent: TutorialFrame = parseMdContent(params.text + '\n\n')
 
   const parsed: Partial<T.Tutorial> = {
+    id: params.skeleton.id,
     version: params.skeleton.version,
     summary: mdContent.summary,
     config: params.skeleton.config || {},