Add filter to conditionally insert the UCF Header placeholder div in header.php

[cjg89]

Description

https://github.com/UCF/UCF-WordPress-Theme/blob/master/header.php#L8

Add a filter to allow child themes to conditionally enable/disable the placeholder div for the UCF Header from being displayed in the header template.

Why it's Important

Child themes may need to have the option of disabling the UCF Header in certain templates entirely. Currently the only way to accomplish this is to completely override the header.php template in the child theme due to this placeholder div being inserted here.

Alternatives

n/a

Possible Implementation

See above

Additional context

n/a