auto and user confirmed deletion of book titles

[kamauln]

Auto deletion currently works well - removing ~.25 of text, but the user confirmed deletion is still too broad and doesn't capture all possible matches. The current workaround is the user just manually deletes the remaining book titles.

[JonathanReeve]

Hi @kamauln and @gracexu7 ! Thanks so much for all this great work. I'm happy to merge it at some point, provided it's cleaned up. At minimum, you'll want to:

• remove everything unnecessary from the PR. .DS_Store files, .ipynb checkpoints—anything that isn't code.
• squash commits together which are all part of the same feature, bugfix, or task. Write good commit messages. "Add files via upload" is not a good commit message, since it doesn't tell us anything useful.
• remove any experiments which use text-matcher but aren't a part of text-matcher itself. Example use cases are OK, but they should be in something like examples/ rather than gender-trouble/ which isn't helpful to others who may be using the repo.

But tests would be good, too, especially if you're changing any functionality.

Let me know when you've done this by requesting my review and unmarking it as a draft. Or close this PR and open a different one later, if you prefer. Thanks again!