Replace missing images

...install/inc/qrcodes/tails_boum_org_install_clone_back.png

...stall/inc/qrcodes/tails_boum_org_install_clone_back_1.png

...ll/inc/qrcodes/tails_boum_org_install_debian_usb_back.png

.../inc/qrcodes/tails_boum_org_install_debian_usb_back_1.png

...ll/inc/qrcodes/tails_boum_org_install_expert_usb_back.png

.../inc/qrcodes/tails_boum_org_install_expert_usb_back_1.png

...all/inc/qrcodes/tails_boum_org_install_linux_usb_back.png

...l/inc/qrcodes/tails_boum_org_install_linux_usb_back_1.png

...all/inc/qrcodes/tails_boum_org_install_mac_clone_back.png

...l/inc/qrcodes/tails_boum_org_install_mac_clone_back_1.png

...stall/inc/qrcodes/tails_boum_org_install_mac_dvd_back.png

...all/inc/qrcodes/tails_boum_org_install_mac_dvd_back_1.png

...stall/inc/qrcodes/tails_boum_org_install_mac_usb_back.png

...all/inc/qrcodes/tails_boum_org_install_mac_usb_back_1.png

...stall/inc/qrcodes/tails_boum_org_install_win_usb_back.png

...all/inc/qrcodes/tails_boum_org_install_win_usb_back_1.png

...install/inc/qrcodes/tails_boum_org_upgrade_clone_back.png

...stall/inc/qrcodes/tails_boum_org_upgrade_clone_back_1.png

...install/inc/qrcodes/tails_boum_org_upgrade_tails_back.png

...stall/inc/qrcodes/tails_boum_org_upgrade_tails_back_1.png