include a launch checklist instead of security/disaster recovery

i couldn't figure out what to put in "security", this seems more like
something in the "must have" (duh).

the disaster recovery is part of a larger launch plan and makes no
sense on its own. it also overlaps with the "as built" design docs.

tsa/howto/template.mdwn

@@ -53,10 +53,9 @@
 
 ## Proposed Solution
 
-## Security
+## Launch checklist
 
-## Disaster Recovery
-<!-- specifically for the launch -->
+<!-- include disaster recovery -->
 
 ## Cost