Update jupyter lite build command documentation (#343)

Author: mcbarton

CONTRIBUTING.md

@@ -150,6 +150,13 @@ To build Jupyter Lite with this kernel without creating a website you can execut
 micromamba create -n xeus-lite-host jupyterlite-core=0.6 jupyter_server jupyterlite-xeus -c conda-forge
 micromamba activate xeus-lite-host
 jupyter lite build --XeusAddon.prefix=$PREFIX
+                   --XeusAddon.mounts="$PREFIX/share/xeus-cpp/tagfiles:/share/xeus-cpp/tagfiles" \
+                   --XeusAddon.mounts="$PREFIX/etc/xeus-cpp/tags.d:/etc/xeus-cpp/tags.d" \
+                   --contents README.md \
+                   --contents notebooks/xeus-cpp-lite-demo.ipynb \
+                   --contents notebooks/smallpt.ipynb \
+                   --contents notebooks/images/marie.png \
+                   --contents notebooks/audio/audio.wav
 ```
 
 Once the Jupyter Lite site has built you can test the website locally by executing

README.md

@@ -151,7 +151,14 @@ To build Jupyter Lite with this kernel without creating a website you can execut
 ```bash
 micromamba create -n xeus-lite-host jupyterlite-core=0.6 jupyter_server jupyterlite-xeus -c conda-forge
 micromamba activate xeus-lite-host
-jupyter lite build --XeusAddon.prefix=$PREFIX
+jupyter lite build --XeusAddon.prefix=$PREFIX               
+                   --XeusAddon.mounts="$PREFIX/share/xeus-cpp/tagfiles:/share/xeus-cpp/tagfiles" \
+                   --XeusAddon.mounts="$PREFIX/etc/xeus-cpp/tags.d:/etc/xeus-cpp/tags.d" \
+                   --contents README.md \
+                   --contents notebooks/xeus-cpp-lite-demo.ipynb \
+                   --contents notebooks/smallpt.ipynb \
+                   --contents notebooks/images/marie.png \
+                   --contents notebooks/audio/audio.wav
 ```
 
 Once the Jupyter Lite site has built you can test the website locally by executing

docs/source/InstallationAndUsage.rst

@@ -133,6 +133,13 @@ To build Jupyter Lite with this kernel without creating a website you can execut
     micromamba create -n xeus-lite-host jupyterlite-core=0.6 jupyter_server jupyterlite-xeus -c conda-forge
     micromamba activate xeus-lite-host
     jupyter lite build --XeusAddon.prefix=$PREFIX
+                       --XeusAddon.mounts="$PREFIX/share/xeus-cpp/tagfiles:/share/xeus-cpp/tagfiles" \
+                       --XeusAddon.mounts="$PREFIX/etc/xeus-cpp/tags.d:/etc/xeus-cpp/tags.d" \
+                       --contents README.md \
+                       --contents notebooks/xeus-cpp-lite-demo.ipynb \
+                       --contents notebooks/smallpt.ipynb \
+                       --contents notebooks/images/marie.png \
+                       --contents notebooks/audio/audio.wav
 
 Once the Jupyter Lite site has built you can test the website locally by executing