Render Hook and page resource metadata

1. Basic - render hook

test1.jpg

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2. Basic - shortcode

test2.jpg

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3. Basic - render hook widths too wide for image

test3.jpg

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4. Basic - render_hook: false (replicated stock markdown handling of img)

test4.jpg

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5. Shortcode img & positional parameters

test5.jpg

6. Custom shortcode "custom-img"

test5.jpg