APIs (#3)

* Initial RESTful API

* RESTful API tests

* Scrapping error handling refactored

* Initial GraphQL API

* GraphQL API tests

pages/500.tsx

@@ -2,7 +2,7 @@ import { FC } from "react";
 import { CustomError } from "../components";
 
 const My500: FC = () => (
-    <CustomError statusCode={500} />
+    <CustomError statusCode={500} statusText={"Internal Server Error"} />
 );
 
 export default My500;