Add test data for Recipes to H2LP

[gfaudriga]

We want to make out code more resilient by implementing some more thorough "real-life" test cases. A good place to look for these examples is nextcloud/cookbook. Their code also relies on Markup data for importing recipes from web sources. Some examples are:

• marmiton.org stopped working  nextcloud/cookbook#1592
• Failed to import from hellofresh.com nextcloud/cookbook#1509
• Failed to import recipie from rezeptwelt.de nextcloud/cookbook#1508