docs: lowercase "app" in get-started overview card for consistency (#241)

Co-authored-by: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

Author: mintlify[bot]

get-started/overview.mdx

@@ -7,7 +7,7 @@ description: "Explore the Velt SDK quickstart, setup paths, and supported featur
 <CardGroup cols={2}>
 
 <Card title="Quickstart" href="/get-started/quickstart" icon="circle-play"  color="#7CE38B" iconType="light">
-    Set up Velt with a fresh App
+    Set up Velt with a fresh app
 </Card>
 
 <Card title="Setup" href="/get-started/quickstart" icon="gear" color="#77BDFB" iconType="light">