Add Deploys-by-Netlify badge to UG homepage (#932)

Author: chalin

userguide/content/en/_index.html

@@ -16,7 +16,14 @@
 {{< /blocks/cover >}}
 
 {{% blocks/lead color="primary" %}}
-Docsy is a theme for the Hugo static site generator that's specifically designed for technical documentation sets. Our aim is to help you get a working documentation site up and running as easily as possible, so you can concentrate on creating great content for your users.
+Docsy is a theme for the Hugo static site generator that's specifically designed
+for technical documentation sets. Our aim is to help you get a working
+documentation site up and running as easily as possible, so you can concentrate
+on creating great content for your users.
+
+<a href="https://www.netlify.com" target="_blank" rel="noopener">
+  <img src="https://www.netlify.com/img/global/badges/netlify-color-accent.svg" alt="Deploys by Netlify" />
+</a>
 {{% /blocks/lead %}}
 
 {{< blocks/section color="dark" type="features">}}