Just as a reminder, nsec.app is non-custodial, so not a huge benefit in self-hosting.

If you still really want that, there are two options:

- hosting a full nsec.app-like service on your domain - read this nostr:naddr1qq2j6m6rwpq5g5ejddfy5c6t2d4xs5mt2dj5vq3qky4kxtyg0uxgw8g5p5mmedh8c8s6sqny6zmaaqj44gv4rk0plausxpqqqp65wmx72kh

- running a special 'hosted' version only for your own keys - that's https://github.com/nostrband/noauth#running-hosted-version-with-docker

Hope this helps.