Support embed preview via metadata

[Ryan-B-W]

Is your new feature related to a problem? Please describe.
When linking to recipes on RecipeSage, services that generate a preview fail to do so since RecipeSage does not include the needed meta tags in the document head.

Describe the solution you'd like
Include the required meta tags to provide recipe image, title, description, url, and site_name (RecipeSage) on recipe pages. Specifically, utilize Open Graph Protocol and potentially also other RDFa based tagging.

Describe alternatives you've considered
Non seem applicable to provide this feature.

Additional context
Other information could potentially be exposed programmatically in this way, for example:

• labels as keywords
• image:alt description of image
• Use RDFa formats like Microdata and Microformats to provide machine-readable annotations of other elements on the page; however, that is incidental to the desire of this feature request and would warrant a separate request.

[julianpoy]

The big challenge with this is that the app is an SPA and has no semblance of SSR (in prod, assets are served from an S3 bucket through CloudFront).

I think this would require some form of SSR to facilitate.

[julianpoy]

I think this could fairly easily be solved by adding a sub-router to the API, and update the share URL to that.

Would probably put it behind recipesage.com/ssr/share