Add support for link types

I wish markdown had something to embed ‘invisible’ metadata.

How about Open Graph Protocol?

  1. It’s “invisible”. Its just an HTML tag which will be invisible in Preview mode.
  2. It’s already an established standard with documentation.
  3. Fairly simple to write, read, and edit.
  4. It’s widely used across the internet (which means we may even be able to automatically import metadata by simply pasting in a URL into Obsidian): Automatically fetch and import metadata using Open Graph Protocol -> YAML Metadata
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