Remove unnecessary known implementations section

extensions/2.0/Khronos/KHR_physics_rigid_bodies/README.md

@@ -31,7 +31,6 @@ This specification depends on [KHR\_collision\_shapes](../KHR_collision_shapes/R
   - [Joints](#joints)
 - [glTF Schema Updates](#gltf-schema-updates)
 - [Object Model](#object-model)
-- [Known Implementations](#known-implementations)
 - [Appendix: Joint Limit Metrics](#appendix-joint-limit-metrics)
 - [Appendix: Full Khronos Copyright Statement](#appendix-full-khronos-copyright-statement)
 
@@ -423,14 +422,6 @@ Trigger event nodes are activated when an collider enters or exits a trigger att
 
 If the `nodeIndex` configuration value is negative or greater than or equal to the number of glTF nodes in the asset, or does not refer to a node with a `trigger` property, the event node is invalid. A behavior graph **MUST NOT** contain two or more nodes of the same event nodes with identical `nodeIndex` configuration values.
 
-## Known Implementations
-
-[Blender importer/exporter](https://github.com/eoineoineoin/glTF_Physics_Blender_Exporter)
-
-[Babylon.js importer](https://github.com/eoineoineoin/glTF_Physics_Babylon)
-
-[Godot importer](https://github.com/eoineoineoin/glTF_Physics_Godot_Importer)
-
 ## Appendix: Joint Limit Metrics
 
 *This section is non-normative.*