add amd64 debian10, debian11, stable/debian11 symlinks to stable/debian10

[MKrupauskas]

Fixes #218

Add symlinks from /debian10/amd64, /debian11/amd64, and /stable/debian11/amd64 to point to /stable/debian10/amd64 to be able to resolve the debian packages when pointing to those repo targets in the apt sources list.

Created the symlinks using the commands below.

$ cd debian10
$ ln -s ../stable/debian10/amd64 amd64
$ cd ../debian11
$ ln -s ../stable/debian11/amd64 amd64
$ cd ../stable/debian11 
$ ln -s ../debian10/amd64 amd64       

[elezar]

@MKrupauskas please see the comment on #218

[elezar]

@MKrupauskas we now have unified DEB repos under /stable/deb (or /experimental/deb).

Please see the instructions here: https://docs.nvidia.com/datacenter/cloud-native/container-toolkit/latest/install-guide.html#installing-with-apt

Closing this PR.