Rename repl to root

Author: dy

README.md

@@ -143,8 +143,8 @@ const code = await bundle('subscript/jessie.js')
 // → self-contained ES module with parse, compile exports
 ```
 
-**REPL** — interactive dialect builder with live bundling:
-[**Try REPL →**](https://dy.github.io/subscript/repl.html)
+**Playground** — interactive dialect builder with live bundling:
+[**Try it →**](https://dy.github.io/subscript/)
 
 
 ## Used by

repl.html index.htmlrepl.html renamed to index.html

@@ -1,7 +1,7 @@
 // @ts-check
 import { test, expect } from '@playwright/test'
 
-const URL = 'http://localhost:8765/repl.html'
+const URL = 'http://localhost:8765/'
 
 test.describe('Subscript REPL', () => {