Fix layout issue for different screen sizes

[fbernaly]

Checklist

• [X ] I've tested my changes.
• [ X] I've updated the documentation, if necessary.
• [ X] I have read the contibution guidelines.

Proposed Changes

The webView is showing behind the navigation bar for some iPhones, I changed it to AutoLayout in order to use safeAreaLayoutGuide, now the webView is not being overlapped by the nav bar in different screen sizes.