Readme: updated mailing list direction

[ilario]

And removed the IRC bridge direction (as it has been abandoned due to the bridge bot kicking people out) and added the link to the communication page on the website.

[codecov-commenter]

Codecov Report

Merging #931 (345c486) into master (5377f5d) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #931      +/-   ##
==========================================
- Coverage   76.73%   76.70%   -0.03%     
==========================================
  Files          48       48              
  Lines        4074     4074              
==========================================
- Hits         3126     3125       -1     
- Misses        948      949       +1     

Impacted Files	Coverage Δ
...kages/lime-system/files/usr/lib/lua/lime/utils.lua	81.06% <0.00%> (-0.30%)	⬇️
packages/pirania/tests/pirania_test_utils.lua	100.00% <0.00%> (ø)

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