Distinguish between demo source and link in readme

Author: langsamu

README.md

@@ -4,7 +4,7 @@
 [![npm version](https://badge.fury.io/js/sparql-blockly.svg)](https://www.npmjs.com/package/sparql-blockly)
 [![codecov](https://codecov.io/gh/langsamu/sparql-blockly/branch/main/graph/badge.svg?token=X55Y21AMAE)](https://codecov.io/gh/langsamu/sparql-blockly)
 
-## [Online demo](https://langsamu.github.io/sparql-blockly/)
+## [Try online](https://langsamu.github.io/sparql-blockly/)
 
 ## Repo structure
 - [Demo app](./demo)