improvement: simplify email design, refactor link/button to re-usable components and improve design

backend/src/services/smtp/emails/BaseLink.tsx

@@ -0,0 +1,15 @@
+import { Link } from "@react-email/components";
+import React from "react";
+
+type Props = {
+  href: string;
+  children: string;
+};
+
+export const BaseLink = ({ href, children }: Props) => {
+  return (
+    <Link href={href} className="text-slate-700 underline decoration-slate-700">
+      {children}
+    </Link>
+  );
+};