Docs: Updated IDE link

README.md

@@ -26,7 +26,7 @@ Most importantly, Lark will save you time and prevent you from getting parsing h
 
 - [Documentation @readthedocs](https://lark-parser.readthedocs.io/)
 - [Cheatsheet (PDF)](/docs/_static/lark_cheatsheet.pdf)
-- [Online IDE (very basic)](https://lark-parser.github.io/lark/ide/app.html)
+- [Online IDE (very basic)](https://lark-parser.github.io/lark/ide)
 - [Tutorial](/docs/json_tutorial.md) for writing a JSON parser.
 - Blog post: [How to write a DSL with Lark](http://blog.erezsh.com/how-to-write-a-dsl-in-python-with-lark/)
 - [Gitter chat](https://gitter.im/lark-parser/Lobby)

docs/index.rst

@@ -113,7 +113,7 @@ Resources
 
 .. _Examples: https://github.com/lark-parser/lark/tree/master/examples
 .. _Third-party examples: https://github.com/ligurio/lark-grammars
-.. _Online IDE: https://lark-parser.github.io/lark/ide/app.html
+.. _Online IDE: https://lark-parser.github.io/lark/ide
 .. _How to write a DSL: http://blog.erezsh.com/how-to-write-a-dsl-in-python-with-lark/
 .. _Program Synthesis is Possible: https://www.cs.cornell.edu/~asampson/blog/minisynth.html
 .. _Cheatsheet (PDF): _static/lark_cheatsheet.pdf