Standardize the JupyterLite links in /try (#834)

Author: jasongrout

try.html

@@ -31,7 +31,7 @@
       description: The latest web-based interactive development environment
       src: try/jupyter.png
       alt: Jupyter logo - Launch JupyterLab demo
-      url: https://jupyter.org/try-jupyter/lab?path=notebooks%2FIntro.ipynb
+      url: https://jupyter.org/try-jupyter/lab/?path=notebooks%2FIntro.ipynb
 
     - title: Jupyter Notebook
       description: The original web application for creating and sharing computational documents
@@ -50,7 +50,7 @@
       description: How to use Jupyter with C++
       src: try/Cpp.svg
       alt: C++ logo - Launch C++ demo
-      url: https://jupyter.org/try-jupyter/lab/index.html?path=notebooks%2Fcpp.ipynb
+      url: https://jupyter.org/try-jupyter/lab/?path=notebooks%2Fcpp.ipynb
 
     - title: Julia
       description: How to use Jupyter with Julia
@@ -68,7 +68,7 @@
       description: How to use Jupyter with R
       src: try/R.svg
       alt: R logo - Launch R demo
-      url: https://jupyter.org/try-jupyter/lab/index.html?path=notebooks%2Fr.ipynb
+      url: https://jupyter.org/try-jupyter/lab/?path=notebooks%2Fr.ipynb
 
     - title: Ruby
       description: How to use Jupyter with Ruby