Hi Steve

plz open /sections/header_section.php and you will see the part where the logo is rendered, so this bit

!-- Logo -->
<div id="logo" class="hide-ball disable-drag">
<a class="ajax-link" data-type="page-transition" href="<?php echo esc_url( get_home_url() ); ?>">
<img class="black-logo" src="<?php echo esc_url( $colega_logo_path ); ?>" alt="<?php echo esc_attr__('Logo Black', 'colega'); ?>">
<img class="white-logo" src="<?php echo esc_url( $colega_logo_light_path ); ?>" alt="<?php echo esc_attr__('Logo White', 'colega'); ?>">
</a>
</div>
<!--/Logo

the only issue I see here is that the img logo has some styles associated so you may want to include your svg file directly into the img tag (so you can upload the svg in customizer)