Automatically handle 404 errors when try to get image from different host

[bookimp]

Describe the bug A clear and concise description of what the bug is.

To Reproduce Steps to reproduce the behavior:

1. Go to https://libread.com/libread/the-rebirth-of-an-ill-fated-consort-65376
2. Download epub with defaul settings other than 3 second delay
3. Get 403 error about logging in (site has no accounts) or solving CAPTCHA
4. You also get a billion failed to dl image errors but I'm less concerned about that.

Expected behavior Epub to download without this popping up a dozen times

Screenshots Attached

Desktop (please complete the following information):

• OS: Windows 11 Home 64bit
• Browser: Opera LVL 5 (core: 109.0.5097.130)

WebToEpub Version 0.0.0.159

Additional context It did allow me to just hit ok on the alert, but I had to be on the download or it stalled.

The Rebirth of an Ill-Fated Consort Chapter 1-207.zip Just in case you want to see the file without having to download the whole thing.