Use webviews to show the errors.

[jonahsnider]

💡 Is your feature request related to a problem? Please describe.
When the settings Gists are deleted, there is an error thrown because the extension can't load it's data.

💡 Describe the solution you'd like
The extension should check if the Gists exist, or at least have a graceful error instead of the one telling you to check the developer console.

[shanalikhan]

instead of the one telling you to check the developer console.

Can you paste the developer console log image so i can see

[jonahsnider]

[shanalikhan]

Pending for #506
#876

[shanalikhan]

Whenever the error is opened, user should be asked to open a detail information page where logs can be displayed in the textbox.
While a solution for generic errors can be provided there at the spot.