update pkgs url

See merge request !5

- we *really* need our rootfs

- note: we need our own rootfs

- newer kernel pkgs from kernel.ubuntu.com are compressed with zstd, the dpkg package in Debian *does not support zstd*

- remove repositories pkg [needs fix]
- remove live user pkg [also needs fix]
- move apt functions to script
- sort pkgs
- update kernel
- remove smplayer
- add vlc, iputils-ping
- variable names in uppercase

Install packages using apt separately to avoid Connection reset issue

See merge request !4