Hello! Yes, HN's lack of notifications really poses a problem in situations like this. Sigh.
However, the answer to your question is fortunately a simple one: the Discord server mentioned is run by the /r/ProgrammingLanguages community over on Reddit [0]! If you go to that page (might need to be on a desktop browser because ugh) and look in the sidebar/do a search for "Discord server", you'll find a stable invite link.
Alternatively, I can just provide you with the current link [1] and note that it may not work forever (for anybody who finds this comment in the future).
However, the answer to your question is fortunately a simple one: the Discord server mentioned is run by the /r/ProgrammingLanguages community over on Reddit [0]! If you go to that page (might need to be on a desktop browser because ugh) and look in the sidebar/do a search for "Discord server", you'll find a stable invite link.
Alternatively, I can just provide you with the current link [1] and note that it may not work forever (for anybody who finds this comment in the future).
[0] https://www.reddit.com/r/programminglanguages/
[1] https://discord.gg/yqWzmkV