Handle offline or bad connection

[jgierer12]

There should be a timeout and warning in place when https://www.pocketcasts.com is unreachable.

[probonopd]

Only a white screen shown when not connected to the internet.

Reference:
AppImage/appimage.github.io#1411

[jgierer12]

Hi! Thanks for adding Pocket Casts to your site!

Unfortunately, the best I'll be able to do is to show a warning when not connected to the internet. This app is just a wrapper around the Pocket Casts website, adding a couple additional features. So if you're not online the site simply won't load, rendering the app useless.

I'll work on showing a warning in that case, though.