feat: implement the nostr protocol

[github-tijlxyz]

Hello, The nostr protocol is a open protocol that can be used to publish articles. You can find more information about the nostr protocol at github.com/nostr-protocol/nostr . This pull request tries to implement nostr's long-form content (NIP-23) into the yarr feeds.

This PR implements:

• The user can input a nostr: user identifier link (it supports dns based links (NIP05) and bech 32 encoded links (NIP19) nprofile or npub.
• The server can load the nostr profile and profile picture, and the server can load nostr posts

below is me trying to explain what I have done to implement nostr into yarr.

I have implemented all the nostr functions and most code into the new worker/nostr.go file. I implemented from the DiscoverFeed, listItems and FindFeedFavicon functions. This is probably not the best place from which to implement it, but im happy to hear your toughts.

In addition to that:

• To parse the nostr posts content I use goldmark and goldmark-nostr for parsing nostr links in the markdown.
• To execute nostr actions I'm using the widely used go-nostr library.

Thank you

https://github.com/user-attachments/assets/d88812a0-0651-4bcf-a7c3-eaf4c5af89e6

[nkanaev]

Hi @github-tijlxyz , thanks for the effort, but I think the protocol's goal doesn't fit yarr's purpose.

There are plenty of nostr clients to choose from which have more advanced functionality than an rss feed can provide.