Update whitepaper url

Author: sdgandhi

get-started.mdx

@@ -130,5 +130,5 @@ const data = await db.collection("City").record("new-york").get();
 <Card title="FAQ" icon="question" href="/faq">
 </Card>
 
-<Card title="Read the Polybase Whitepaper" icon="file-lines" href="https://polybase.xyz/Polybase%5FA%5Fdecentralized%5FQuery%5FIndex%5Fand%5FStorage%5FProtocol-v2.0.pdf">
+<Card title="Read the Polybase Whitepaper" icon="file-lines" href="https://polybase.xyz/whitepaper">
 </Card>