[docs] Create a unified CI guide #7151
Description
What is your Scenario?
CI-specific guides are good but aren't universally applicable + it's hard to keep them up to date. Better to describe general principles
https://testcafe.io/documentation/402634/guides#continuous-integration
What are you suggesting?
Create a unified CI guide + find a way to preserve the rest of the info
What alternatives have you considered?
No response
Additional context
No response