Apply prettier auto-formatting to docs/index.md and fix a couple things off there

Author: tleonhardt

docs/index.md

@@ -26,30 +26,35 @@ app.cmdloop()
 ```
 
 <!-- Getting Started -->
+
 {%
    include-markdown "./overview/index.md"
 %}
 
 <!-- Migrating from cmd -->
+
 {%
    include-markdown "./migrating/index.md"
 %}
 
-<!-- Features -->
+## Features
+
 {%
    include-markdown "./features/index.md"
     start="<!--intro-start-->"
     end="<!--intro-end-->"
 %}
 
-<!-- Examples -->
+## Examples
+
 {%
    include-markdown "./examples/index.md"
     start="<!--intro-start-->"
     end="<!--intro-end-->"
 %}
 
-<!-- Plugins -->
+## Plugins
+
 {%
    include-markdown "./plugins/index.md"
     start="<!--intro-start-->"