I'm attempting to return a pop-up warning for users who click an external link on my site. The issue is, the functionality must still be there if JS is disabled. I think this would leave PHP as my only option, so would this be accomplished with a custom plugin? I've seen sites accomplish something similar with a separate redirect php include with the link destination in a query string. My experience developing Craft plugins is virtually nil so forgive my ignorance- but would that look like a plugin that finds and rewrites all the external links' hrefs on the existing page, returns the html for the modal (appends a fullscreen div to the dom), and populates a "continue to external link" anchor based on the original link in the query string? Am I on the right track here?