IntelliSense doc

[jennifer-shehane]

After some internal discussion, we decided that an "IntelliSense" or IDE tooling doc would be helpful on its own.

There was a lot of confusion around the TypeScript doc - where many people didn't understand that you could utilize IntelliSense within Cypress without using TypeScript.

We can also add the json schema setup for IntelliSense in our cypress.json.

"IntelliSense" is technically a term specific to Visual Studio Code, the technical broader term being "Intelligent code completion", which is why I'm hesitant to name the actual code document "IntelliSense" - and possibly make it a broader - "Using Cypress in your IDE" document.

[jennifer-shehane]

Also, not everyone uses an IDE and may technically just be using a text editor.

"Integrating with Dev Environments"
"Intelligent Code Completion"