/// Get the icon-glyph vallue from the `$icons` list variable.
/// @author Diego Versiani
/// @param {String} $icon-name - Name of the icon corresponding to an icon value in the `$icons` list variable.
/// @return {String} - Icon glyph value.
@function icon-glyph( $icon-name ) {
    @if not map-has-key( $icons, $icon-name ) {
        @warn "No icon found for `#{$icon-name}` in $icons map. Property omitted.";
    }

    @return map-get( $icons, $icon-name );
}