Confirm if we need to notify user when a new WebView update is available

reference: focus has same issue mozilla-mobile/focus-android#1237

This is coming from a security review on WebView for Zerda.
https://docs.google.com/document/d/1H7fQIyxRqe7ourXOGbELE_4Z7-ASIztuEiQxtqZnkdQ/edit#heading=h.4z3ocg9beeok

In summary: Users are widely unaware that they need to update their WebView version to stay secure while browsing with Focus. We might be able to mitigate the risk by educating or even nagging users about the importance of updates.