Feature: Multiple REMOTE_ISF_URLs

[TheMythologist]

Also removes duplicates of word "the"

[ikelos]

Thanks, could you provide a rationale for why having multiple remote ISF urls would be useful? My concern is the order of application, which I can see you've reversed to prioritize the first one. This then also requires any users that have specified it in their default options to change their configurations (and know that the first one in the list takes precedence, which might be confusing to people). I'd just like to talk/think this through a bit more before going ahead with it please...

[TheMythologist]

My rationale for this was that we could provide multiple ISF URLs to reference, especially if you're using online ones that are curated by the community (not by yourself). I could also edit the code to be backwards compatible if that is your concern. Alternatively, if you don't see the need for this feature, feel free to close this PR entirely 😅