Move all files installed below /usr/share in the same directory

Also move the grub theme to /usr/share/grub/themes/kali/ as installing
files in /boot/ is problematic on arm where /boot is often a vfat
partition that doesn't support hardlinks as required by dpkg.

Gbp-Dch: Full

README.md

@@ -4,13 +4,20 @@ This package joins together all files that are related to theming
 and configuration of the visual appearance. They were formerly split
 across gnome-theme-kali, kali-defaults and desktop-base.
 
+## file structure
+
+All "data" files (`share/*` and what's built in the kali-logos and emblems
+directory) are provided by kali-themes-common while the configuration
+files (`etc/*`) are provided by kali-themes.
+
 ## desktop-base integration
 
 desktop-base integration is provided by kali-desktop-base through
 registration of various files in alternatives defined by the desktop-base
 package. The files are not installed in /usr/share/desktop-base/
 except for a symlink tree mimicking a "destkop-base theme". That symlink
-tree is pre-built in the "desktop-base" directory in the source package.
+tree is pre-built in the "share/desktop-base/kali-themes" directory in the
+source package.
 
 The kali-themes-common package is also installing various symlinks
 trees to mimick directories that are traditionnally handled by

debian/kali-themes-common.install

@@ -1,10 +1,4 @@
-Backgrounds/* usr/share/backgrounds/kali/
 share/* usr/share/
-Icon-Theme/* usr/share/icons/
-Window-Theme/* usr/share/themes/
-Grub-Theme/* boot/grub/themes/
-Plymouth-Theme/* usr/share/plymouth/themes/
-desktop-base/* usr/share/desktop-base/kali-theme/
 # Those are created by "make install"
 usr/share/icons/
 usr/share/images/