docs(launcher): update instructions to make the launcher example works

Author: luciemac

examples/validation/launcher/README.md

@@ -1,6 +1,21 @@
+## Python environment
+
+#### Define a virtual environment
+
+python -m venv ./env
+. ./env/bin/activate
+
+#### Install requirements
+
+pip install trame trame-vtk trame-vuetify trame-components vtk
+
 ## Generate client side to serve
-python -m trame.tools.www --output ./www vuetify vtk trame
+
+python -m trame.tools.www --output ./www --client-type vue2
 
 ## Start launcher
+
 mkdir -p viz-logs
-python -m wslink.launcher ./config.json
+python -m wslink.launcher ./config.json
+
+Open http://localhost:8080/