Add back project_urls; update outdated shiny website links

Author: cpsievert

README.md

@@ -2,7 +2,7 @@ shinywidgets
 ================
 
 Render [ipywidgets](https://ipywidgets.readthedocs.io/en/stable/) inside a
-[Shiny](https://pyshiny.netlify.app/) app.
+[Shiny](https://shiny.rstudio.com/py) app.
 
 ## Installation
 
@@ -213,7 +213,7 @@ run entirely in the browser). [py-shinylive](https://github.com/rstudio/py-shiny
 
 In some cases, the package(s) that you want to use may not come pre-bundled with
 `{shinywidgets}`; and in that case, you can [include a `requirements.txt`
-file](https://pyshiny.netlify.app/examples/#extra-packages) to pre-install those other
+file](https://shinylive.io/py/examples/#extra-packages) to pre-install those other
 packages
 
 ## Troubleshooting

setup.cfg

@@ -19,7 +19,10 @@ classifiers =
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
-
+project_urls =
+    Bug Tracker = https://github.com/rstudio/py-shinywidgets/issues
+    Documentation = https://github.com/rstudio/py-shinywidgets/
+    Source Code = https://github.com/rstudio/py-shinywidgets/
 
 [options]
 python_requires = >=3.7