Update installation instruuctions

Author: SylvainCorlay

README.md

@@ -78,14 +78,13 @@ jupyter nbextension enable --py --sys-prefix widgetsnbextension  # can be skippe
 conda install -c conda-forge ipywidgets
 ```
 
-- Add ipywidgets to JupyterLab after installing with pip or conda (note that this requires nodejs to be installed and that the package name is different):
+- Install the front-end extension to JupyterLab (note that this requires nodejs to be installed):
 
+   * For JupyterLab 1.0.x and 1.1.x, use `jupyter labextension install @jupyter-widgets/[email protected]`
+   * For JupyterLab 1.2.x, use `jupyter labextension install @jupyter-widgets/[email protected]`
+   * For JupyterLab 2.x, use `jupyter labextension install @jupyter-widgets/[email protected]`
 
-```
-jupyter labextension install @jupyter-widgets/jupyterlab-manager
-```
-
-See the [Installation](docs/source/user_install.md) section of the documentation for additional details.
+   See the [Installation](docs/source/user_install.md) section of the documentation for additional details.
 
 ### Installing from git
 

packages/jupyterlab-manager/README.md

@@ -20,19 +20,10 @@ jupyter labextension install @jupyter-widgets/jupyterlab-manager
 Use the appropriate command from the following list to install a compatible
 JupyterLab extension.
 
-* For JupyterLab 0.30, use `jupyter labextension install @jupyter-widgets/[email protected]`
-* For JupyterLab 0.31rc1, use `jupyter labextension install @jupyter-widgets/[email protected]`
-* For JupyterLab 0.31rc2, use `jupyter labextension install @jupyter-widgets/[email protected]`
-* For JupyterLab 0.31.x, use `jupyter labextension install @jupyter-widgets/[email protected]`
-* For JupyterLab 0.32.x, use `jupyter labextension install @jupyter-widgets/[email protected]`
-* For JupyterLab 0.33.x, use `jupyter labextension install @jupyter-widgets/[email protected]`
-* For JupyterLab 0.34.x, use `jupyter labextension install @jupyter-widgets/[email protected]`
-* For JupyterLab 0.35.x, use `jupyter labextension install @jupyter-widgets/[email protected]`
 * For JupyterLab 1.0.x and 1.1.x, use `jupyter labextension install @jupyter-widgets/[email protected]`
 * For JupyterLab 1.2.x, use `jupyter labextension install @jupyter-widgets/[email protected]`
 * For JupyterLab 2.x, use `jupyter labextension install @jupyter-widgets/[email protected]`
 
-
 Source Build
 ------------
 
@@ -50,4 +41,4 @@ jupyter labextension link .
 
 **Rebuild**
 
-If you want to pull in changes to Jupyter widgets, run `npm run build` at the ipywidgets repo root to update the version of Jupyter widgets in the node_modules directory and rebuild the JupyterLab extension.
+If you want to pull in changes to Jupyter widgets, run `npm run build` at the ipywidgets repo root to update the version of Jupyter widgets in the `node_modules` directory and rebuild the JupyterLab extension.