Adding eli5 video to the home page (#3115)
Adding eli5 video to the home page (#3115)

Summary:
*Before* submitting a pull request, please make sure the following is done...

1. Fork the repo and create your branch from `master`.
2. If you've added code that should be tested, add tests!
3. If you've changed APIs, update the documentation.
4. Ensure that:
  * The test suite passes (`npm test`)
  * Your code lints (`npm run lint`) and passes Flow (`npm run flow`)
  * You have followed the [testing guidelines](https://github.com/facebook/draft-js/wiki/Testing-for-Pull-Requests)
5. If you haven't already, complete the [CLA](https://code.facebook.com/cla).

Please use the simple form below as a guideline for describing your pull request, and delete these instructions.

Thanks for contributing to Draft.js!

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Here at Meta Open Source, we've been creating short-form videos to explain Meta OSS projects in the simplest terms possible. We started embedding these videos into project pages as you can see in [Docusaurus home page](https://docusaurus.io/).

[...]

#### Test Plan**
Here is a screenshot  in how it looks:
![image](https://user-images.githubusercontent.com/12485205/154300953-04f2e6d3-e3bd-4e86-a8f2-97cd42f0c35f.png)

[...]

Pull Request resolved: https://github.com/facebook/draft-js/pull/3115

Reviewed By: prontiol

Differential Revision: D34273442

Pulled By: dmitryvinn-fb

fbshipit-source-id: 852d5a3654a5b15a26308f8e80fde1df86bed99f

facebook/draft-js