If you deleted the line in the Persona theme, just run ./nodebb build tpl && ./nodebb restart, and that should be it.
NodeBB in WHMCS
Can some awesome developer make nodebb intregrated in whmcs, im looking for this for a long time, if you can make this, make it! i want to pay for it!
Are you wanting NodeBB inside whmcs or NodeBB looking the same as WHMCS so when they click forum theming won't change much