Remove obsolete code for deprecated python client (#288)

This PR removes code for the deprecated datacommons and
datacommons_pandas packages

It also adds a top level README that points to the datacommons-client
README and updates the deprecation notice and removes release
instructions for the deprecated packages

Author: n-h-diaz

README.md

@@ -0,0 +1,20 @@
+# Data Commons Python API
+
+This is a Python library for accessing data in the Data Commons Graph.
+
+See the `datacommons-client` [README](datacommons_client/README.md) for details on installation and usage.
+
+## About Data Commons
+
+[Data Commons](https://datacommons.org/) is an open knowledge repository that
+provides a unified view across multiple public data sets and statistics. You can
+view what [datasets](https://datacommons.org/datasets) are currently ingested
+and browse the graph using our [browser](https://datacommons.org/browser).
+
+## License
+
+Apache 2.0
+
+## Support
+
+For questions, please send an email to `support@datacommons.org`.

datacommons/README.md

@@ -1,43 +1 @@
-**DEPRECATED: This library is no longer maintained. Please migrate to the [datacommons_client](https://pypi.org/project/datacommons-client/) library. For help on translating your requests, see the [Migration guide](https://docs.datacommons.org/api/python/v2/migration.html).**
-
-# Data Commons Python API
-
-This is a Python library for accessing data in the Data Commons Graph.
-
-> See also: [Data Commons Pandas API](../datacommons_pandas/README.md).
-
-To get started, install this package from pip.
-
-```bash
-pip install datacommons
-```
-
-Once the package is installed, import `datacommons`.
-
-```python
-import datacommons as dc
-```
-
-For more detail on getting started with the API, please visit our
-[API Overview](https://docs.datacommons.org/api/).
-
-When you are ready to use the API, you can refer to `examples` for
-examples on how to use this package to perform various tasks. More tutorials and
-documentation can be found on our [tutorials page](https://docs.datacommons.org/tutorials/)!
-
-## About Data Commons
-
-[Data Commons](https://datacommons.org/) is an open knowledge repository that
-provides a unified view across multiple public data sets and statistics. You can
-view what [datasets](https://datacommons.org/datasets) are currently ingested
-and browse the graph using our [browser](https://datacommons.org/browser).
-
-## License
-
-Apache 2.0
-
-## Support
-
-For general questions or issues about the API, please open an issue on our
-[issues](https://github.com/google/datacommons/issues) page. For all other
-questions, please send an email to `support@datacommons.org`.
+**DEPRECATED: This library has been deprecated. Please migrate to the [datacommons_client](https://pypi.org/project/datacommons-client/) library. For help on translating your requests, see the [Migration guide](https://docs.datacommons.org/api/python/v2/migration.html).**