Final deprecation/archive docs (#275)

After this is merged, we can set the repo as archived.

README.md

@@ -2,6 +2,9 @@
 
 PySpark bindings for Mozilla Telemetry
 
+The underlying data no longer exists, so this repository is archived.
+See the [`fx-data-dev` mailing list posting for more information](https://mail.mozilla.org/pipermail/fx-data-dev/2019-November/000291.html).
+
 ## Documentation
 
 Online documentation is available at https://mozilla.github.io/python_moztelemetry/

docs/index.rst

@@ -7,8 +7,8 @@ python_moztelemetry
 ===================
 
 .. warning::
-    This library will stop working *VERY SOON* (if it hasn't stopped
-    working already)
+    This library no longer works, as the underlying heka-framed protobuf
+    data no longer exists.
 
     Please see `this post <https://mail.mozilla.org/pipermail/fx-data-dev/2019-November/000291.html>`_ to fx-data-dev for more information.