Rename web-ui -> playground

Author: fwcd

README.md

@@ -44,15 +44,15 @@ First make sure to have [Emscripten](https://emscripten.org/) installed. If you
 
 >`npm run build-wasm`
 
-### Web-UI
+### Playground
 
 After compiling the grammar to WebAssembly, you can invoke
 
->`npm run web-ui`
+>`npm run playground`
 
-to launch an interactive editing environment that displays the parsed syntax tree on-the-fly:
+to launch an interactive editing environment that displays the parsed syntax tree on-the-fly in the browser. You can also view a deployed version of this playground [on the web](https://fwcd.github.io/tree-sitter-kotlin).
 
-![Screenshot](web-ui-screenshot.png)
+![Screenshot](playground-screenshot.png)
 
 ## Documentation
 

package.json

@@ -9,7 +9,7 @@
     "generate": "tree-sitter generate",
     "parse": "tree-sitter parse",
     "build-wasm": "tree-sitter build-wasm",
-    "web-ui": "tree-sitter web-ui"
+    "playground": "tree-sitter playground"
   },
   "repository": {
     "type": "git",