✨ Add article thumb, cover and feature images

exampleSite/content/samples/emoji/index.md

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+---
+title: "Emoji :parachute:"
+date: 2019-03-05
+description: "Guide to Emoji usage in Congo"
+summary: "📖🏞️🧗🏽🐉🧙🏽‍♂️🧚🏽👸"
+tags: ["emoji", "sample"]
+---
+
+Emoji is supported throughout Congo by default. Emoji can be used in titles, menu items and article content.
+
+{{< alert >}}
+**Note:** The rendering of these glyphs depends on the browser and the platform. To style the emoji you can either use a third party emoji font or a font stack.
+{{< /alert >}}
+
+Emoji replacements are automatic throughout Congo, so you can use shorthand codes in your content and front matter and they will be converted to their corresponding symbols at build time.
+
+**Example:** `see_no_evil` :see_no_evil:, `hear_no_evil` :hear_no_evil:, `speak_no_evil` :speak_no_evil:.
+
+The [Emoji cheat sheet](http://www.emoji-cheat-sheet.com/) is a useful reference for emoji shorthand codes.