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/.reuse/dep5 b/.reuse/dep5
index 3998153..f85f3a7 100644
--- a/.reuse/dep5
+++ b/.reuse/dep5
@@ -1,5 +1,9 @@
 Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 
-Files: VERSION images/* _static/* dict.txt
+Files: VERSION images/* *.png *.svg dict.txt
 Copyright: 2021 Open Networking Foundation
 License: Apache-2.0
+
+Files: _static/fonts/Inconsolata*.ttf
+Copyright: 2006 Raph Levien
+License: OFL-1.1