Embed images via next-images

[xMartin]

• Cache-busting via content hash in filename
• Sharing image as an example

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[Twissi]

When working with sharing images before I noticed that cache busting doesn't always help. Especially for fb I always need to re-crawl the website after updating the image using the debug tools: https://developers.facebook.com/tools/debug/

[xMartin]

@Twissi Yes, Facebook caches the image for a day or so but if there's no change in the file name for me it didn't get ever updated, also not with the debugger.

Independently of that, we should have cache busting for all assets.

[Twissi]

@mamhoff Can you please update the branch?