doc: removed reference to ENTT_STANDALONE

docs/md/config.md

@@ -7,7 +7,6 @@
 
 * [Introduction](#introduction)
 * [Definitions](#definitions)
-  * [ENTT_STANDALONE](#entt_standalone)
   * [ENTT_NOEXCEPT](#entt_noexcept)
   * [ENTT_HS_SUFFIX and ENTT_HWS_SUFFIX](#entt_hs_suffix_and_entt_hws_suffix)
   * [ENTT_USE_ATOMIC](#entt_use_atomic)
@@ -38,14 +37,6 @@ Each parameter can result in internal library definitions. It's not recommended
 to try to also modify these definitions, since there is no guarantee that they
 will remain stable over time unlike the options below.
 
-## ENTT_STANDALONE
-
-`EnTT` is designed in such a way that it works (almost) everywhere out of the
-box. However, this is the result of many refinements over time and a compromise
-regarding some optimizations.<br/>
-It's worth noting that users can get a small performance boost by passing this
-definition to the compiler when the library is used in a standalone application.
-
 ## ENTT_NOEXCEPT
 
 The purpose of this parameter is to suppress the use of `noexcept` by this