Stop making threads in #help-js

[vcarl]

Nobody posts there anymore, probably annoyed at the threads 🤷

[what-the-diff]

PR Summary

• Simplified the Initialization of 'threadChannels'
  The way we declare threadChannels has been changed. Instead of starting with certain channels already listed, it is now an empty list that will only contain Strings (text-based channels). This change makes our code cleaner and more flexible, ready for adding new channels in an easier way.