Update docs to mention adding other kernels (#94)

* Add kernel not in installation page

* Update configuration page

* Update docs/installation.md

Co-authored-by: martinRenou <[email protected]>

* try fixing backticks

---------

Co-authored-by: martinRenou <[email protected]>

Author: jtpio

docs/configuration.md

@@ -42,6 +42,7 @@ The `jupyterlite_config.json` containing the following:
     "LiteBuildConfig": {
         "federated_extensions": [
             "https://conda.anaconda.org/conda-forge/noarch/bqplot-0.12.33-pyhd8ed1ab_0.tar.bz2",
+            "https://github.com/jupyterlite/pyodide-kernel/releases/download/v0.0.5/jupyterlite_pyodide_kernel-0.0.5-py3-none-any.whl"
         ],
         "ignore_sys_prefix": true
     }
@@ -53,6 +54,9 @@ The `jupyterlite_config.json` containing the following:
 }
 ```
 
+The example above also includes the Pyodide kernel for JupyterLite as a `federated_extensions`.
+See the [JupyterLite documentation](https://jupyterlite.readthedocs.io/en/latest/howto/index.html) to learn more about configuring your environment.
+
 Then you should be able to show Notebooks working with bqplot!
 
 ```rst

docs/installation.md

@@ -17,3 +17,16 @@ extensions = [
 ```
 
 JupyterLite should automatically show up in your built online documentation. To preview it locally, you can navigate to the build directory (e.g. `_build/html`) and use `python -m http.server` to serve the site.
+
+````{note}
+By default `jupyterlite-sphinx` does not install a Python kernel.
+If you would like have a Python kernel available in your docs you can install either `jupyterlite-pyodide-kernel` or `jupyterlite-xeus-python` with `pip`:
+
+```shell
+# to install the Python kernel based on Pyodide
+pip install jupyterlite-pyodide-kernel
+
+# to install the Python kernel based on Xeus Python
+pip install jupyterlite-xeus-python
+```
+````