Update Sphinx

- Bump versions in requirements.txt

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

Replace logo with SVG version
- Was a WebP saved as .png which broke in some browsers.
- Shift logo to sidebar, as in all other docs sites.

Cleanup Makefile

Change how the dict.txt sorter works
- Only check the dict.txt for changes
- Give human-intelligible results

Add correct licensing info for fonts

Add code of conduct and link

Change-Id: Ie4334cfea826e348eca4c93ed62a3633b33ad87c
diff --git a/README b/README
new file mode 100644
index 0000000..2242cf7
--- /dev/null
+++ b/README
@@ -0,0 +1,20 @@
+.. SPDX-FileCopyrightText: 2021 Open Networking Foundation <info@opennetworking.org>
+   SPDX-License-Identifier: Apache-2.0
+
+SD-Fabric Docs
+==============
+
+This site contains Sphinx format documentation for the SD-Fabric 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.