Update themes.md

articles/hubs/themes.md

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+# Theming 
+
+![Themes for Hubs](https://github.com/stoplightio/docs/blob/develop/assets/gifs/hubs-theming.gif?raw=true)
+
+## What 
+
+Theming brings your API documentation to life. It allows you to easily modify color schemes and add textures to your documentation. There are four different theme settings that can be modified:  Primary Color, Secondary Color, Background, and Texture. 
+
+### Primary Color
+Primary Color applies any color to primary actions and appears only once per page. It modifies objects that you want to draw attention to like buttons. 
+
+### Secondary Color 
+Secondary Color applies any color to other secondary actions. This includes links and active items. 
+
+### Background 
+Background Color applies any color to your header.
+
+### Texture
+Texture applies a texture to your header.
+
+## How
+1. Select the **Hub** you wish to modify
+2. Select the **Design View** 
+3. Click on **Settings** at the top of the screen 
+4. Select **Theme** in the sidebar 
+5. Select a pre-selected color or choose your own color with the eyedropper 
+6. Select a texture 
+
+