I came across that app a little while ago - it definitely inspired my current side project! https://github.com/SaahilClaypool/SearchStory which is a similar locally-hosted web app with a Lucene search index
I've been building a locally-hosted version of Pocket that saves articles (and pdfs) to a lucene index, and provides full text search over them. https://github.com/SaahilClaypool/SearchStory