How do I create a search-able index of online pages?

I’d like to make an online index of existing web pages.
The website is not mine, but it doesn’t have a search tool nor have it anytime soon.

I can download them all to my local computer, and make them all wordpress pages (I’m good at it, but not at SQL) but I think my missing link is how to correlate the content with the real online page. If I had an existing tool / system to index pages that would probably fill in the gap, because I don’t really need the content other than to create the index. After that, the content is useless.

Any idea?

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