'Configuration overview' section was moved to overview.md file

bin/docs

@@ -118,8 +118,12 @@ class DocWriter
     end
 
     def linkify(text)
+      if text == "Configuration overview"
+        "overview"
+      else
         text.downcase.gsub(" ", "-")
       end
+    end
 
     def titlify(text)
       text.capitalize.gsub("-", " ")