docs: Add carnivorousplants.co.uk to the showcase

docs/content/showcase/carnivorousplants.md

@@ -0,0 +1,13 @@
+---
+date: 2017-05-13T11:00:00Z
+description: "Tools, guides, and interactive resources for growers of all carnivorous plant species."
+license: ""
+licenseLink: ""
+sitelink: https://www.carnivorousplants.co.uk/
+tags:
+- blog
+- education
+thumbnail: /img/carnivorousplants-tn.png
+title: CarnivorousPlants.co.uk
+---
+