Add support for image links

[chrischrischris]

Create linked images by setting href and title attributes on img elements. This is then converted to an <a> surrounding the picture element.

Requires da-collab PR: adobe/da-collab#47

URL for testing:

• https://image-links--da-live--adobe.hlx.page/

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Commits

• 5bdc241 ✅ (latest)
• 9765467 ✅
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