Remove the navmesh from the bundled environment as its not being used

and the artifacting is painful

src/assets/environments/cliff_meeting_space/bundle.json.tpl

@@ -18,9 +18,6 @@
     {
       "name": "outdoor-geometry", "src": "<%= require("./OutdoorFacade_mesh.glb") %>"
     },
-    {
-      "name": "collision", "src": "<%= require("./FloorNav_mesh.glb") %>"
-    },
     {
       "name": "cliff-geometry", "src": "<%= require("./CliffVista_mesh.glb") %>"
     }