static: Don't ship visual design file and unused images

- Move all the unused image files into doc/visual_design directory.

- Reduces the size of the shipped .deb binary significantly.

Closes: #1840.

Tests performed:

- Ensure that each of the files moves are not referenced anywhere in the source
code.

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

debian/copyright

@@ -16,12 +16,16 @@ Files: doc/*.xml
 Copyright: 2011-2019 FreedomBox Authors
 License: CC-BY-SA-4.0
 
-Files: static/themes/default/FreedomBox-Logo.7z
+Files: doc/visual_identity/apple-touch-icon*
-       static/themes/default/img/network-freedombox.svg
+       doc/visual_identity/FreedomBox-Identity-Manual.pdf
-       static/themes/default/img/FreedomBox-logo-*
+       doc/visual_identity/freedombox-logotype.png
-       static/themes/default/img/freedombox-logo-*
+       doc/visual_identity/freedombox-logo-*
+       doc/visual_identity/FreedomBox-logo-*
+       doc/visual_identity/FreedomBox-Logo.7z
        static/themes/default/img/apple-touch-icon*
-       static/themes/default/FreedomBox-Identity-Manual.pdf
+       static/themes/default/img/favicon.ico
+       static/themes/default/img/freedombox-logo-*
+       static/themes/default/img/network-freedombox.svg
 Copyright: 2012 FreedomBox Foundation
 Comment: Original Author: Robert Martinez
 License: GPL-3+