Unfurls/previews #12098
Description
Problem Statement
Today, unfurls for develop.sentry.dev show nothing, and for docs.sentry.io mostly just show a large graphic, which clutters things quickly.
Solution Brainstorm
A nice middle ground would be to only use a small/icon image if one must be used, and then to have a summary of each page that can be shown as a textual preview. Ideally, the image preview would be a relevant image from the page or section if it exists, only falling back to the default if there are no other images.
Here are some examples:
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