Switch the base framework from Create React App to Next.JS

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

src/hooks/common/use-single-string-url-parameter.ts

@@ -0,0 +1,17 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { useRouter } from 'next/router'
+import { useMemo } from 'react'
+
+export const useSingleStringUrlParameter = <T>(parameter: string, fallback: T): string | T => {
+  const router = useRouter()
+
+  return useMemo(() => {
+    const value = router.query[parameter]
+    return (typeof value === 'string' ? value : value?.[0]) ?? fallback
+  }, [fallback, parameter, router.query])
+}