DOC: Add documentation development documentation

Author: thewtex

docs/development.md

@@ -1,5 +1,7 @@
 # Development
 
+## Package
+
 Setup your system for development:
 
 ```bash
@@ -13,3 +15,38 @@ pytest --nbmake examples/*.ipynb
 If Python code is changed, restart the kernel to see the changes.
 
 **Warning**: This project is under active development. Its API and behavior may change at any time. We mean it 🙃.
+
+## Documentation
+
+Setup your system for documentation development on Unix-like systems:
+
+```bash
+git clone https://github.com/InsightSoftwareConsortium/itkwidgets.git
+cd itkwidgets/docs
+pip install -r requirements.txt
+```
+
+Build and serve the documentation:
+
+```bash
+make html
+python -m http.server -d _build/html 8787
+```
+
+Then visit *http://localhost:8787/* to see the rendered documentation.
+
+### JupyterLite
+
+The documentation includes an embedded JupyterLite deployment. To update the
+JupyterLite deployment, it is recommended to call `make clean` before starting
+a new build to avoid build caching issues. Also, serve the rendered
+documentation on a different port to avoid browser caching issues.
+
+Notebooks served in the JupyterLite deployment can be found at
+*docs/jupyterlite/files*.
+
+Support package wheels, including the `itkwidgets` wheel are referenced in
+*docs/jupyter/jupyterlite_config.json*. To update the URLs there, copy the
+download link address for a wheel found at https://pypi.org in a package's *Download
+files* page. Additional wheel files, if not on PyPI, can be added directly at
+*docs/jupyterlite/files/*.