DOC: Describe JupyterLite deployment

Author: thewtex

docs/deployments.md

@@ -1,8 +1,34 @@
 # Deployments
 
+## JupyterLite
+
+<a href="./_static/lab/index.html">
+Try it!
+
+![Jupyterlite](https://jupyterlite.rtfd.io/en/latest/_static/badge.svg)
+</a>
+
+[JupyterLite](https://jupyterlite.readthedocs.io/en/latest/) is a JupyterLab distribution that runs entirely in the browser built from the ground-up using JupyterLab components and extensions.
+
+To use itkwidgets in a JupyterLite deployment, install the
+[imjoy-jupyterlab-extension](https://pypi.org/project/imjoy-jupyterlab-extension/)
+JupyterLab 3 federated extension. Optionally, pre-install the itkwidgets wheel
+and its dependency. In the Pyodide notebook,
+
+```python
+import piplite
+piplite.install("itkwidgets==1.0a5")
+```
+
+Here we are installing the specific pre-release version pre-installed. See
+also [the JupyterLite configuration used for this documentation](https://github.com/InsightSoftwareConsortium/itkwidgets/blob/main/docs/jupyterlite_config.json) and the
+[Sphinx / ReadTheDocs
+configuration](https://github.com/InsightSoftwareConsortium/itkwidgets/blob/main/docs/conf.py)
+used for this documentation.
+
 ## Colab
 
-Google Colab is a free-to-use hosted Jupyter notebook service that provides
+[Google Colab](https://research.google.com/colaboratory/) is a free-to-use hosted Jupyter notebook service that provides
 computing resources including GPUs and itkwidgets is now supported in Colab
 notebooks! You can get started with a demo notebook: [![Open in Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/InsightSoftwareConsortium/itkwidgets/blob/main/examples/Hello3DWorld.ipynb)
 
@@ -13,8 +39,7 @@ Or visit the [welcome page](https://colab.research.google.com/?utm_source=scs-in
 Notebooks can be uploaded from a repository, Google Drive, or your local machine.
 
 
-Jupyter Notebook
-----------------
+## Jupyter Notebook
 
 To use itkwidgets locally first [install Jupyter Notebook](https://jupyter.org/install#jupyter-notebook) and start Jupyter:
 
@@ -26,14 +51,13 @@ jupyter notebook
 If you'd rather interact with remotely hosted notebooks you can also open them
 in Binder: [![Open in Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/InsightSoftwareConsortium/itkwidgets/main?urlpath=%2Fnotebooks%2Fexamples%2F)
 
-Jupyterlab
-----------
+## JupyterLab
 
 To use itkwidgets locally first [install JupyterLab](https://jupyter.org/install#jupyterlab) and start Jupyter:
 
 ```bash
 pip install jupyterlab
-jupyter-lab
+jupyter lab
 ```
 
 If you'd rather interact with remotely hosted notebooks in JupyterLab you can