[docs] create a video that explains Element Selectors

[titerman]

What is your Scenario?

The Element Selectors article is one of the longest and most important articles in our documentation. The length is justified by the complexity of the subject. We should do something to help new TestCafe users get a basic understanding of Selectors without reading the entire article.

What are you suggesting?

Create a video tutorial that explains Selectors.

• [ ] Write a script
• [ ] Record a video
• [ ] Request voice over
• [ ] Publish the video
• [ ] Embed the video into the documentation article

What alternatives have you considered?

No response

Additional context

No response