Defining color palette

Define new colors for variables $primary, $success, $info, $warning and $danger, and remove secondary from theme colors map.

SCSS:

$primary:       #264653;
$success:       #2A9D8F;
$info:          #E9C46A;
$warning:       #F4A261;
$danger:        #E76F51;
$theme-colors: map-remove($theme-colors, "secondary");