Change accessMode to an array of modes

Author: Gmac4247

index.html

@@ -107,7 +107,7 @@
     "url": "https://basic-geometry.github.io/about"
   },
   "alternateName": "Exact Geometry",
-"accessMode": "mathOnVisual" ,
+  "accessMode": ["textual", "visual"],
 "accessibilityFeature": [
 "dyslexicFriendly", 
 "machine-readable",