Updates readme description.

stow/sass/style-child-theme.scss

@@ -3,7 +3,7 @@ Theme Name: Stow
 Theme URI: https://github.com/Automattic/themes/stow
 Author: Automattic
 Author URI: https://automattic.com/
-Description: A design system for WordPress sites built with Gutenberg.
+Description: A bold and clean theme - Stow is the ideal choice for creating an online presence for your business.
 Requires at least: WordPress 4.9.6
 Version: 1.0
 License: GNU General Public License v2 or later

stow/style-rtl.css

@@ -4,7 +4,7 @@ Theme Name: Stow
 Theme URI: https://github.com/Automattic/themes/stow
 Author: Automattic
 Author URI: https://automattic.com/
-Description: A design system for WordPress sites built with Gutenberg.
+Description: A bold and clean theme - Stow is the ideal choice for creating an online presence for your business.
 Requires at least: WordPress 4.9.6
 Version: 1.0
 License: GNU General Public License v2 or later