fix(v2): make proper path to pages in TS

[lex111]

Motivation

This was not a quick way to add support for pages in TypeScript - one, two, and finally this third (and last) attempt for this! Now officially D2 supports the creation of pages in TS, woohoo!

Corresponding request on Canny - https://docusaurus.canny.io/admin/board/feature-requests/p/typescript-pages

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

1. Create a page in TS (eg page.tsx) with any valid contents, for example:

import React, {useEffect} from 'react';
import Layout from '@theme/Layout';

function Page() {
  let name: string = 'TypeScript';

  return (
    <Layout>
      <div className="container margin-vert--xl">
        <h1>Hello {name}!</h1>;
      </div>
    </Layout>
  );
}

export default Page;

2. Start D2 and check it out new page by navigating on /page

Related PRs

(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/facebook/docusaurus, and link to your PR here.)

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[yangshun]

Haha finally! Thanks Alexey!