requires https://github.com/TryGhost/Ghost-Admin/pull/1293
- updates `oembed` endpoint behaviour
- if an oembed provider is not found then we use `metascraper` to populate a metadata object
- when metadata is returned rather than an oembed response the payload will look like this:
```json
{
"url": "...",
"type": "bookmark",
"metadata": {
"url": "...",
"title": "...",
"description": "...",
"author": "...",
"publisher": "...",
"thumbnail": "...",
"icon": "..."
}
}
```
- adds a `bookmark` card which generates output for the bookmark card:
```html
<figure class="kg-card kg-bookmark-card">
<a href="[URL]" class="kg-bookmark-container">
<div class="kg-bookmark-content">
<div class="kg-bookmark-title">[TITLE]</div>
<div class="kg-bookmark-description">[DESCRIPTION]</div>
<div class="kg-bookmark-metadata">
<img src="[ICON]" class="kg-bookmark-icon">
<span class="kg-bookmark-author">[AUTHOR]</span>
<span class="kg-bookmark-publisher">[PUBLISHER]</span>
</div>
</div>
<div class="kg-bookmark-thumbnail">
<img src="[THUMBNAIL]">
</div>
</a>
</figure>
```
- if a particular bit of data does not exist then the associated html element will not be present
refs https://github.com/TryGhost/Ghost/issues/9505
- updates mobiledoc converter's `render` method to accept a `version` argument
- `1` === Ghost 1.0's markdown-only renderer output
- `2` === Koenig's full mobiledoc renderer output
- switch between mobiledoc renderer versions in Post model's `onSaving` hook
- version 1 by default
- version 2 if Koenig is enabled (currently behind dev experiments config + labs flag)
- version 2 if the post's mobiledoc is not compatible with the markdown-only renderer
- "version 2" full-Koenig mobiledoc renderer output
- wraps content in a `.kg-post` div
- removes wrapper around markdown and html card output
- adds classes to image card output including selected image size/style
- standardises es6 usage across mobiledoc related files
