'imgix.cosmicjs.com' image domain in cms-cosmic example

[FranciscoMoretti]

Bug-fix: 'imgix.cosmicjs.com' image domain is needed for the cms-cosmic example

• Fixes Cms-cosmic example uses image domain that's not in next.config.js #31702
• Integration tests added
• Errors have helpful link attached, see contributing.md

Solution

As suggested by the output I got while running the exapmle, I've added the domain to next.config.js

event - compiled successfully in 129 ms (552 modules)
error - node_modules\next\dist\client\image.js (660:33) @ defaultLoader
Error: Invalid src prop (https://imgix.cosmicjs.com/8efcc570-9a21-11ea-bf2a-2b6ff88d4f06-e73aee30-1db0-11ea-a594-a170ead8b2cb-12.jpg?auto=format,compress,enhance&w=100&h=100) on `next/image`, hostname "imgix.cosmicjs.com" is not configured under images in your `next.config.js`
See more info: https://nextjs.org/docs/messages/next-image-unconfigured-host
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Examples

• Make sure the linting passes by running yarn lint