feat: Add marketing theme

[KeithClinard]

Theme generated using:

// Brand colors
$primary: #00447c;
$blue: #005da6;
$red: #e1251b;
$cyan: #00adef;
$green: #80bc00;
$yellow: #ffb71b;

// Non-Brand colors
$secondary: #426f9a;
$success: #21ba45;
$info: #00b3aa;
$warning: #f2721c;
$danger: #9f3938;

$font-family-sans-serif: Montserrat, Calibri, sans-serif;