Hide simple-smp page and Move it after macros-spec

Author: Sporarum

docs/sidebar.yml

@@ -71,10 +71,11 @@ subsection:
           - page: reference/metaprogramming/macros.md
           - page: reference/metaprogramming/macros-spec.md
             hidden: true
+          - page: reference/metaprogramming/simple-smp.md # description of a simplified metaprogramming language, this might not be the best place for it
+            hidden: true
           - page: reference/metaprogramming/staging.md
           - page: reference/metaprogramming/reflection.md
           - page: reference/metaprogramming/tasty-inspect.md
-          - page: reference/metaprogramming/simple-smp.md
       - title: Other New Features
         index: reference/other-new-features/other-new-features.md
         subsection: