FR: #4048 - Add color customization to the chatbot (#4885)

Co-authored-by: crazywoola <427733928@qq.com>

web/types/app.ts

@@ -246,6 +246,12 @@ export type SiteConfig = {
   title: string
   /** Application Description will be shown in the Client  */
   description: string
+  /** Define the color in hex for different elements of the chatbot, such as:
+   * The header, the button , etc.
+    */
+  chat_color_theme: string
+  /** Invert the color of the theme set in chat_color_theme */
+  chat_color_theme_inverted: boolean
   /** Author */
   author: string
   /** User Support Email Address */