Improve r/boards to make it the official (daily) communication tool

[moul]

• prevent spam on r/boards ->
  • limit some boards to people with r/users
  • allow adding multiple moderators to a board
  • what do you suggest?
• prevent spam on r/users ->
  • force invite, no more "pay for register" (easily abusable with faucet loop)
  • add a way to blacklist a spammer
  • what do you suggest?
• improve usability and experience
  • finish the Keplr integration (https://github.com/gnolang/gno/pull/154)
  • limit noise by adding more subtle ways to interact, i.e. reactions
  • sort threads by last update date
  • make the comment counter recursive
  • help organize threads w/ labels
• misc
  • bot that posts to Discord to get notified of changes, could be done in a hacky way or in a clean way alongside an official validator

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Edit from @jaekwon:

We can prevent spam on r/users with a screenshot distribution; now more or less most of the people have tokens.

• pay to register with a reasonable start fee, but maybe also considering throttling (max X per minute, say).
• users with "admin" role can freeze any set of accounts (but not delete them).

Then r/boards can be moderated better.

• by default require /r/users username.
• allow anonymous posts optionally with minimum fee.