Pub/Sub: remove unreferenced samples [(#2986)](GoogleCloudPlatform/python-docs-samples#2986)

* remove qs samples

* update README

Author: anguillanneuf

samples/snippets/README.rst

@@ -61,22 +61,6 @@ Install Dependencies
 Samples
 -------------------------------------------------------------------------------
 
-Quickstart
-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-
-.. image:: https://gstatic.com/cloudssh/images/open-btn.png
-   :target: https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/GoogleCloudPlatform/python-docs-samples&page=editor&open_in_editor=pubsub/cloud-client/quickstart.py,pubsub/cloud-client/README.rst
-
-
-
-
-To run this sample:
-
-.. code-block:: bash
-
-    $ python quickstart.py
-
-
 Publisher
 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++