Update install with pip

Author: kpinnipa

docs/getting_started/installation.rst

@@ -7,16 +7,25 @@ Requirements
 ~~~~~~~~~~~~
 JupyterLab >= 3.0
 
-Install
-~~~~~~~
-
+Install with jupyter
+~~~~~~~~~~~~~~~~~~~~
 .. code:: bash
 
     jupyter labextension install jupyterlab-code-snippets
     jupyter lab clean
     jupyter lab build
+    
+Install with pip
+~~~~~~~~~~~~~~~~
+.. code:: bash
+
+    pip install jupyterlab-code-snippets
+    jupyter lab clean
+    jupyter lab build
 
 Uninstall
 ~~~~~~~~~
 .. code:: bash
 jupyter labextension uninstall jupyterlab-code-snippets
+
+pip uninstall jupyterlab-code-snippets