Remove unused private modules

scrbl/js-maker.scrbl

@@ -719,7 +719,6 @@ The package uses this layout:
 js-maker/
   main.rkt
   info.rkt
-  private/
   testing/
   demo/
   scrbl/
@@ -728,10 +727,6 @@ js-maker/
 @filepath{main.rkt} is the public module.  @filepath{testing/} contains the
 executor and regression framework.  @filepath{demo/} contains generated-code
 examples.  @filepath{scrbl/} contains this reference and the use-case document.
-The @filepath{private/} directory contains compatibility/helper material from
-the source project.  The current public module and tests do not depend on those
-private files; they are kept for downstream compatibility and are omitted from
-compilation and the package test entry point in @filepath{info.rkt}.
 
 @section{Limitations and non-goals}