Add an option to ignore domains

[alexppg]

Is your feature request related to a problem? Please describe.
If a domain goes down for whatever reason and you dont't want/can't update the urls, you have to add all the urls to the configuration file.

Describe the solution you'd like
It would be a lot easier if you could just have a list of domains to ignore.

Describe alternatives you've considered
Adding the urls manually can make it work, but you'll may end with a config file of hundreds of lines.

[Simran-B]

IgnoreURLs - Array of regexs of URLs to ignore.

Since it accepts regular expressions, this is already possible, e.g.:

IgnoreURLs:
  - ^https?://(www\.)?example\.org\b

The above regex should match all of the following URLs:

• http://www.example.org
• https://www.example.org
• http://example.org
• https://example.org
• http://www.example.org/foo/bar
• https://www.example.org/whatever/path.html?ts=1234&submit=true
• ...

[wjdp]

You don't technically need regex for this but the result isn't as good. If you don't want to check example123.com. This will match all links containing that string:

IgnoreURLs:
  - example123.com

• http://example123.com
• https://example123.com/abc
• https://anothersite.test/example123.com ← perhaps not ideal

You could add a scheme but that would ignore a url like https://anothersite.test/https://example123.com which you'd probably want to catch using an HTML tester.

The docs aren't very clear on this point. I'll update them with @Simran-B 's solution. I'm tempted to add an IgnoreDomains setting which does the legwork for you though.