[org] Clean up & document `SingaporeJS` Github repos

[joeytwiddle]

(converted from Erik's card on the project board)

There are many repos in our org that I don't have any idea about, I think we should clean them up and document about what's left.

Some actionable items I suggest:

• [ ] Remove deprecated Gitter-related stuffs if we decide to permanently to Telegram
• [ ] Reduce to properly 2-3 repos:
  • This repo for talk.js
  • Probably singaporejs.github.io for our website and other things
  • (Optional) organisers repo for internal stuffs (although I think we can use singaporejs repo for it

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To do? (get all votes then we move forwards with it)

• [ ] @ongmin
• [ ] @joeytwiddle
• [x] @eriknguyen

[joeytwiddle]

How about archiving the old repos? Other people worked on them! Could they be useful to anyone else in future?

Although I suppose the forks would still exist, even if we remove them for clarity. OK then I'm fine with it.