Remove deleted organizations

[psjnek]

Remove the deleted account in data:

Checking that all orgs listed are in fact, an org...

In civic_hackers.yml, in the Civic Hackers group, the following entries are users, not orgs:

thacker

In civic_hackers.yml, in the Code For America group, the following entries are users, not orgs:

c4gnv

In governments.yml, in the U.S. Military and Intelligence group, the following entries are users, not orgs:

screamlab