Remove unused React import and add type declaration for GiscusComments component

Author: AjdinDev

src/components/GiscusComments/index.tsx

@@ -1,4 +1,3 @@
-import React from 'react';
 import Giscus from '@giscus/react';
 import { useColorMode } from '@docusaurus/theme-common';
 import useDocusaurusContext from '@docusaurus/useDocusaurusContext';

src/types/global.d.ts

@@ -0,0 +1,4 @@
+declare module '@site/src/components/GiscusComments' {
+  const GiscusComments: React.FC;
+  export default GiscusComments;
+}