Merge pull request #1227 from dfinity/rvandersmith/disambiguate-core-standalone

fix: replace the term 'core' with 'standalone'

Author: rvanasa

motoko/README.md

@@ -1,6 +1,6 @@
 # Motoko examples
 
-## Core Motoko
+## Standalone Motoko
 
 These examples show the Motoko language as a backend language for the IC, operating directly with clients, without a front end component.