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

share/icons/Flat-Remix-Blue-Dark/emblems/scalable/emblem-favorite.svg

@@ -0,0 +1 @@
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