v2v/installing: chapter 2 done

Signed-off-by: May <sirhuntthepure@users.noreply.github.com>
v2v/introduction: finish further reading section

Signed-off-by: May <sirhuntthepure@users.noreply.github.com>
v2v: eliminate RHN-related TODOs

Signed-off-by: May <sirhuntthepure@users.noreply.github.com>