Added link to contribute guide in the dropdown menu.

Author: davidevaleriani

content/posts/how-to-contribute/index.md

@@ -1,10 +1,10 @@
 ---
 title: "How to Contribute"
 date: 2019-10-10T21:37:03-04:00
-draft: true
 description: "See how you can contribute to the matplotblog."
 categories: ["tutorials"]
 displayInList: true
+displayInMenu: true
 draft: false
 author: Davide Valeriani
 resources: