docs: point Juno showcase tile to its website (#1670)

Small update to the Juno tile in the "Trusted by" section: it now links
to Juno's website (junocompanion.com), which is the canonical page for
the app and links to both the App Store and Google Play. Alt text
updated to describe the app more accurately.

Thanks for the library, it's been great for our chat composer.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: MarshallBear1 <marshall@juno-chat.com>

Author: MarshallBear1

docs/src/pages/index.tsx

@@ -169,8 +169,8 @@ const trustedBy = [
   },
   {
     img: "https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/2a/e4/a9/2ae4a9e5-40b0-1ee3-1382-c7f66361d38e/AppIcon-0-0-1x_U007epad-0-1-85-220.png/512x512bb.jpg",
-    alt: "Juno text chat app",
-    link: "https://apps.apple.com/us/app/juno-chronic-illness-support/id6749455368?uo=4",
+    alt: "Juno chronic illness companion app",
+    link: "https://junocompanion.com/",
     name: "Juno",
   },
   {