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/index.rst b/index.rst
index 3c3ce81..dcfb678 100644
--- a/index.rst
+++ b/index.rst
@@ -1,12 +1,10 @@
 .. SPDX-FileCopyrightText: 2021 Open Networking Foundation <info@opennetworking.org>
 .. SPDX-License-Identifier: Apache-2.0
 
-.. image:: images/overview-logo.png
-   :width: 400px
-   :align: center
 
-Overview
-========
+
+SD-Fabric
+=========
 
 SD-Fabric is an open source, full stack, deeply programmable network fabric optimized for edge cloud,
 5G, and Industry 4.0 applications.
@@ -49,7 +47,7 @@
 
 
 Highlights
-==========
+----------
 
 .. image:: images/overview-topo.png
    :width: 500px
@@ -105,11 +103,3 @@
 
    release/process.rst
    release/1*
-
-.. toctree::
-   :maxdepth: 2
-   :caption: Misc
-   :hidden:
-   :glob:
-
-   readme