Docs incorrectly refer to starting server in plugins as anti-pattern

[BlueWinds]

Subject

guides

Description

In https://docs.cypress.io/guides/getting-started/testing-your-app#Step-1-Start-your-server and again in https://docs.cypress.io/guides/references/best-practices#Web-Servers, the docs refer to starting your app's server from inside Cypress as a bad idea.

It absolutely is a bad idea to do this from withing a test - do not use cy.exec() or cy.task(). But it is extremely common to start a development server from within the plugins file / cypress.config.js, and we should show people how to do it there with an example / short sample code.