chore: updated dark mode text (#1129)

Description:

This PR updates the dark mode text for this article,
https://app.documenso.com/articles/signature-disclosure

apps/web/src/app/(unauthenticated)/articles/signature-disclosure/page.tsx

@@ -5,7 +5,7 @@ import { Button } from '@documenso/ui/primitives/button';
 export default function SignatureDisclosure() {
   return (
     <div>
-      <article className="prose">
+      <article className="prose dark:prose-invert">
         <h1>Electronic Signature Disclosure</h1>
 
         <h2>Welcome</h2>