Docs: add emilyhorsman.com (buttercup theme) to showcase

docs/content/showcase/emilyhorsman.com.md

@@ -0,0 +1,13 @@
+---
+lastmod: 2016-01-09
+date: 2016-01-09T01:00:10Z
+description: Personal homepage
+sitelink: https://emilyhorsman.com/
+sourceLink: https://github.com/emilyhorsman/buttercup
+tags:
+- personal
+- blog
+thumbnail: /img/emilyhorsman.com-tn.jpg
+title: emilyhorsman.com
+---
+