Add mainSections definition; set pagination to 5

exampleSite/config.toml

@@ -3,10 +3,11 @@ languageCode = "en-us"
 title = "Basic Hugo Theme"
 copyright = "Copyright © 2019, Copyright Owner Name | Built with [Hugo](https://gohugo.io/)"
 theme = "basic-theme"
-paginate = 10
+paginate = 5
 
 [permalinks]
   posts = "/:year/:month/:title/"
 
 [params]
   subtitle = "A theme with no CSS and only basic layouts"
+  mainSections = [ "posts" ]