Add essential property to Social type for about page display

Author: Aryan-Techie

src/types/content.types.ts

@@ -59,6 +59,8 @@ export type Social = Array<{
    * The link is not validated by code, make sure it's correct
    */
   link: string;
+  /** Whether this social link is essential and should be displayed on the about page */
+  essential?: boolean;
 }>;
 
 /**