feat: update links from postgres.new to database.build

Author: gregnr

apps/postgres-new/components/ide.tsx

@@ -271,7 +271,7 @@ function Footer() {
         target="_blank"
         rel="noopener noreferrer"
       >
-        Learn about postgres.new
+        Learn about database.build
       </a>
     </div>
   )

apps/postgres-new/components/workspace.tsx

@@ -134,8 +134,8 @@ export default function Workspace({
         <div className="grid gap-6 mt-4">
           <h2 className="text-lg font-bold">Mobile Support Coming Soon</h2>
           <p>
-            <a className="underline" href="https://postgres.new">
-              postgres.new
+            <a className="underline" href="https://database.build">
+              database.build
             </a>{' '}
             is in early Alpha and is{' '}
             <a className="underline" href="https://supabase.com/blog/postgres-new">