Update sidebar and add title info

docs/_config.yml

@@ -138,6 +138,8 @@ sidebar:
           url: /plugin-recipes/
         - title: Slots and Plugins
           url: /slots-and-plugins/
+        - title: Plugins API
+          url: /plugins-api/
     - title: Tutorials
       children:
         - title: Creating a Basic Plugin

docs/source/04-07-plugins-api.md

@@ -1,4 +1,8 @@
-# Plugins API
+---
+title: Plugins API
+permalink: /plugins-api/
+---
+
 This is a set of utilities that we expose to create or add functionality to the Plugins. Feel free to check all the utilities here at `talk/plugin-api`.
 
 ## Actions