Update Sphinx

Fix font licensing

Add spelling dict tests

Remove sphinx docs which were duplicated everywhere, refer to ONF main
docs site which is more complete

Add code of conduct and link

Change-Id: I35764345f09a4dcb082a73d4a1c0c04ce889c4a3
diff --git a/README b/README
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+.. SPDX-FileCopyrightText: 2021 Open Networking Foundation <info@opennetworking.org>
+   SPDX-License-Identifier: Apache-2.0
+
+Aether Docs
+===========
+
+This site contains Sphinx format documentation for the Aether project.
+Please see the `Sphinx section of ONF Docs
+<https://docs.opennetworking.org/docs/sphinx.html>`_ for instructions on how to
+contribute to this documentation.
+
+Code of Conduct
+---------------
+
+We expect all ONF employees, member companies, and participants to abide by our
+`Code of Conduct <https://docs.opennetworking.org/policies/conduct.html>`_
+
+If you are being harassed, notice that someone else is being harassed, or have
+any other concerns involving someone’s welfare, please notify a member of the
+ONF team or email conduct@opennetworking.org.
+