Update .NA entries

[groundcat]

This PR is created to update the .NA entries.

@dnsguru has obtained confirmation directly from the .NA registry, as documented in #2199 (comment) and #2198 (comment) :

I am friends with .NA and reached out by private email (sorry, won't share) but got the following response from them about the structure of "official" subdomains underneath .NA

Here is the list he provided me:

na
alt.na
co.na
com.na
gov.na
net.na
org.na

They actually asked if we would purge the balance of them - I will note this in #2198