chore: update discord link in docs

[tserg]

What I did

Update Discord link.

How I did it

See docs

How to verify it

See docs

Commit message

docs: update Discord link

Description for the changelog

Update Discord link in documentation

Cute Animal Picture

[codecov-commenter]

Codecov Report

Merging #3031 (e9e065f) into master (2db84a9) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3031      +/-   ##
==========================================
- Coverage   88.34%   88.34%   -0.01%     
==========================================
  Files          97       97              
  Lines       10958    10963       +5     
  Branches     2588     2590       +2     
==========================================
+ Hits         9681     9685       +4     
- Misses        829      830       +1     
  Partials      448      448              

Impacted Files	Coverage Δ
vyper/codegen/expr.py	85.23% <0.00%> (-0.18%)	⬇️
vyper/ast/expansion.py	94.44% <0.00%> (+0.50%)	⬆️

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[charles-cooper]

i think we should use the same link as in the readme -- https://discord.gg/6tw7PTM7C2