Sure: Edge Delivery does not mandate any particular test framework. The boilerplate allows you to use the tooling of your choice. Many projects use Web Test Runner (WTR), but Puppeteer and Playwright etc are fine, too.

Sure, you can modify scripts.js to fit your needs, e.g. add logic that skips loading the header on line 106: https://github.com/adobe/aem-boilerplate/blob/main/scripts/scripts.js#L106 A common pattern is to use metadata properties(global or page level) to toggle certain features. getMetadata() makes...