✨ Add article thumb, cover and feature images

exampleSite/content/samples/external/index.md

@@ -0,0 +1,14 @@
+---
+title: "External Article - Why I switched to Fathom Analytics"
+date: 2019-01-24
+externalUrl: "https://jamespanther.com/writings/i-switched-from-google-analytics-to-fathom-analytics/"
+summary: "The `externalUrl` front matter parameter can link to any URL. This article looks just like any other, but will link to a post that is outside the Hugo project."
+showReadingTime: false
+_build:
+  render: "never"
+  list: "local"
+---
+
+This page uses the `externalUrl` front matter parameter to link to an article outside of this Hugo website.
+
+It's great for things like linking to posts on Medium or to research papers you may have hosted on third party websites.