Upgrade Next.js Image Component Demos

[max-programming]

This PR updates the Next.js Image Component Demos

1. nextjs-next-image-loader
2. nextjs-next-image-domain

Major changes

• The custom loader function only accepts quality as a number, otherwise it is received as undefined. Hence the options like q_auto:best don't work and fallback to q_auto. So the user has to manually prepend the optimizations to the src URL.
• The quality prop in Next.js Image only accepts a number, hence values like auto_best, auto:good won't work with the loader approach

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[max-programming]

@colbyfayock Should I update the nextjs-custom-image-loader example to be like these recently updated examples or do you want it to be as it is?

[colbyfayock]

might as well update the other one just like the rest of the projects, but lets merge this one in for now to get it going. thanks @max-programming