feat(themes): Added custom theme support.

src/components/EmptyChat.tsx

@@ -40,9 +40,7 @@ const EmptyChat = ({
       </div>
       <div className="flex flex-col items-center justify-center min-h-screen max-w-screen-sm mx-auto p-2 space-y-4">
         <div className="flex flex-col items-center justify-center w-full space-y-8">
-          <h2 className="text-black/70 dark:text-white/70 text-3xl font-medium -mt-8">
-            Research begins here.
-          </h2>
+          <h2 className="text-3xl font-medium -mt-8">Research begins here.</h2>
           <MessageInput
             firstMessage={true}
             loading={false}