docs: Remove defunct IRC channel from README.md

[JFreegman]

We can replace this with a tox groupchat once we make a release.

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (26d41fc) 74.42% compared to head (d89677f) 74.32%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2456      +/-   ##
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- Coverage   74.42%   74.32%   -0.10%     
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  Files          87       87              
  Lines       26264    26264              
==========================================
- Hits        19546    19522      -24     
- Misses       6718     6742      +24     

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[emdee-is]

Do you really want to remove the only public forum for discussion on Tox?

I know the IRC channel is dead, but it wasn't, and it was bi-directionally gatewayed into a Tox NGC. Maybe the Tox NGC has died too, but the IRC should be kept alive in case there are users, or potential users. It is expected that an opensource software package has a libera chat to help users, and it was a good place for lurking former/retired/paused developers (@iphydf :-,) to keep an eye on things.

Instead of abandoning the IRC and editing the documentation, I think you should revive the IRC bridge, and respond to users, or maybe even potential users.

[JFreegman]

Do you really want to remove the only public forum for discussion on Tox?

We've moved development discussion to a public tox groupchat, which is still very much active. The reason we're not putting the ID in the readme yet is because the DHT groupchats aren't in a release yet, but that should happen any day now. If you want to join, the ID is: 360497DA684BCE2A500C1AF9B3A5CE949BBB9F6FB1F91589806FB04CA039E313

We stopped using Libera because its servers are run by an unethical and very immature group of people who blatantly violate the privacy of their users as well push censorship on them. Tox is an inherently an anti-censorship, pro-privacy project; it simply makes no sense for us to continue using such a service, especially when we now have a fully functioning public groupchat implementation of our own.

[emdee-is]

I'll keep the followup discussion in #2455