readme: update download links (#5120)

* Add Browser extension hyperlink to README

* readme: refferal links

* fix android link

---------

Co-authored-by: David Cardenas <[email protected]>

README.md

@@ -4,9 +4,11 @@
 
 > the Ethereum wallet that lives in your pocket!
 
-📲️ [Available on the iOS App Store.](https://apps.apple.com/us/app/rainbow-ethereum-wallet/id1457119021)
+📲️ [Available on the iOS App Store.](https://apps.apple.com/app/apple-store/id1457119021?pt=119997837&ct=github&mt=8)
 
-🤖 [Android Beta available on Google Play Store](https://play.google.com/store/apps/details?id=me.rainbow)
+🤖 [Android available on the Google Play Store](https://play.google.com/store/apps/details?id=me.rainbow&utm_campaign=gh&utm_source=referral&utm_medium=gh)
+
+💻 [Browser extension available on](https://rainbow.me/download?utm_campaign=gh&utm_source=referral&utm_medium=gh), [Chrome](https://chrome.google.com/webstore/detail/rainbow/opfgelmcmbiajamepnmloijbpoleiama?utm_campaign=gh&utm_source=referral&utm_medium=gh), [Brave](https://chrome.google.com/webstore/detail/rainbow/opfgelmcmbiajamepnmloijbpoleiama?utm_campaign=gh&utm_source=referral&utm_medium=gh), [Edge](https://chrome.google.com/webstore/detail/rainbow/opfgelmcmbiajamepnmloijbpoleiama?utm_campaign=gh&utm_source=referral&utm_medium=gh), [FireFox](https://addons.mozilla.org/en-US/firefox/addon/rainbow-extension/?utm_campaign=gh&utm_source=referral&utm_medium=gh), and [Arc](https://chrome.google.com/webstore/detail/rainbow/opfgelmcmbiajamepnmloijbpoleiama?utm_campaign=gh&utm_source=referral&utm_medium=gh).
 
 🐦️ [Follow us on Twitter](https://twitter.com/rainbowdotme)