Child theme remove function controling colours

Hi everyone,

I know nothing about function and, am therefore stuck with my new site.
We are using Bizlight Theme and have created a child theme mainly to control the colour of links depending on where they are on the site i.e breadcrumb, paragraph… and the different headers.

My understanding is these colours are controlled by the following file general.php which is located in this folder wp-content/themes/bizlight/inc/customizer/colors.

<?php
global $bizlight_panels;
global $bizlight_sections;
global $bizlight_settings_controls;
global $bizlight_repeated_settings_controls;
global $bizlight_customizer_defaults;

/*creating panel for general*/
$bizlight_panels['bizlight-colors'] =
    array(
        'title'          => __( 'Colors', 'bizlight' ),
        'description'    => __( 'Customize colors of you awesome site', 'bizlight' ),
        'priority'       => 42,
    );

/*Default color*/
$bizlight_sections['colors'] =
    array(
        'priority'       => 40,
        'title'          => __( 'Basic Colors Options', 'bizlight' ),
        'panel'          => 'bizlight-colors',
    );
/*Bizlight colors reset*/
$bizlight_sections['bizlight-colors-reset'] =
    array(
        'priority'       => 60,
        'title'          => __( 'Bizlight Colors Reset', 'bizlight' ),
        'panel'          => 'bizlight-colors',
    );
/*defaults values*/
$bizlight_customizer_defaults['bizlight-h1-h6-color'] = '#212121';
$bizlight_customizer_defaults['bizlight-link-color'] = '#212121';
$bizlight_customizer_defaults['bizlight-link-hover-color'] = '#ff0000';
$bizlight_customizer_defaults['bizlight-site-identity-color'] = '#ffffff';

$bizlight_customizer_defaults['bizlight-color-reset'] = '';

/**
 * Reset color settings to default
 * @param  $input
 *
 * @since bizlight 1.0
 */
if ( ! function_exists( 'bizlight_color_reset' ) ) :
    function bizlight_color_reset( $input ) {
        if ( $input == 1 ) {
            global $bizlight_customizer_defaults;

            /*getting fields*/
           $bizlight_customizer_saved_values = bizlight_get_all_options();

            /*setting fields */
            $bizlight_customizer_saved_values['bizlight-h1-h6-color'] = $bizlight_customizer_defaults['bizlight-h1-h6-color'];
            $bizlight_customizer_saved_values['bizlight-link-color'] = $bizlight_customizer_defaults['bizlight-link-color'];
            $bizlight_customizer_saved_values['bizlight-link-hover-color'] = $bizlight_customizer_defaults['bizlight-link-hover-color'];
           $bizlight_customizer_saved_values['bizlight-site-identity-color'] = $bizlight_customizer_defaults['bizlight-site-identity-color'];

            $bizlight_customizer_defaults['bizlight-color-reset'] = '';

            /*resetting fields*/
            bizlight_reset_options( $bizlight_customizer_saved_values );
        }
        else {
            return '';
        }
    }
endif;

$bizlight_settings_controls['bizlight-link-color'] =
    array(
        'setting' =>     array(
            'default'              => $bizlight_customizer_defaults['bizlight-link-color'],
        ),
        'control' => array(
            'label'                 =>  __( 'Link Color', 'bizlight' ),
            'section'               => 'colors',
            'type'                  => 'color',
            'priority'              => 40,
            'active_callback'       => ''
        )
    );
$bizlight_settings_controls['bizlight-link-hover-color'] =
    array(
        'setting' =>     array(
            'default'              => $bizlight_customizer_defaults['bizlight-link-hover-color'],
        ),
        'control' => array(
            'label'                 =>  __( 'Link Hover Color', 'bizlight' ),
            'section'               => 'colors',
            'type'                  => 'color',
            'priority'              => 45,
            'active_callback'       => ''
        )
    );
$bizlight_settings_controls['bizlight-h1-h6-color'] =
    array(
        'setting' =>     array(
            'default'              => $bizlight_customizer_defaults['bizlight-h1-h6-color'],
        ),
        'control' => array(
            'label'                 =>  __( 'Heading (H1-H6) Color', 'bizlight' ),
            'section'               => 'colors',
            'type'                  => 'color',
            'priority'              => 50,
            'active_callback'       => ''
        )
    );
$bizlight_settings_controls['bizlight-site-identity-color'] =
    array(
        'setting' =>     array(
            'default'              => $bizlight_customizer_defaults['bizlight-site-identity-color'],
       ),
       'control' => array(
            'label'                 =>  __( 'Site Identity Color', 'bizlight' ),
           'description'           =>  __( 'Site title and tagline color', 'bizlight' ),
            'section'               => 'colors',
            'type'                  => 'color',
            'priority'              => 65,
            'active_callback'       => ''
        )
    );

/*Bizlight colors setting controls*/
$bizlight_settings_controls['bizlight-color-reset'] =
   array(
       'setting' =>     array(
           'default'              => $bizlight_customizer_defaults['bizlight-color-reset'],
            'sanitize_callback'    => 'bizlight_color_reset',
           'transport'            => 'postmessage',
       ),
      'control' => array(
            'label'                 =>  __( 'Reset', 'bizlight' ),
           'description'           =>  __( 'Caution: Reset all above color settings to default. Refresh the page after save to view the effects. ', 'bizlight' ),
            'section'               => 'bizlight-colors-reset',
           'type'                  => 'checkbox',
          'priority'              => 220,
          'active_callback'       => ''
        )
    );

How can I overwrite this function and take full control of the links and header colours?

I’ve tried to find a solution and understand other examples but like I said functions are not my thing at all.