Update user docs with new Selenium 4 features

[diemol]

🚀 Feature Proposal

Selenium 4 brings a set of all-new features and https://www.selenium.dev/documentation/en/ needs to be updated to contain the related docs for them.

Motivation

It'd be nice to have the following new features covered in the docs:

• Relative locators
• CDP integration
• New Grid 4.0

Example

...

[AutomatedTester]

SeleniumHQ/seleniumhq.github.io#461

[AutomatedTester]

SeleniumHQ/seleniumhq.github.io#476

[luisfcorreia]

Please add the following to grid documentation:
Better examples with related context

[diemol]

This is already a work in progress and is being done at https://github.com/SeleniumHQ/seleniumhq.github.io

[github-actions]

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