SEO: Add `Recipe` Schema

[AJGeel]

• Add Recipe Schema SEO to be indexed in the Category tag for search engines.

Learn more:

• https://schema.org/Recipe

[AJGeel]

Added in 0caa97a7cdd96c61ef160b05c4a0f0127f11ee8a.

This turned out to be really simple.

• I used import { Recipe, WithContext } from "schema-dts"; for type hinting/safety.
• I used https://developers.google.com/search/docs/appearance/structured-data/recipe#structured-data-type-definitions to read about required and recommended tags.

I did not end up using the totalTime tag. This would have been a great addition, but currently the metadata.time is in string form, while it requires the iso 8601 date format.