feat(discord): add server started notification

[garrappachc]

No description provided.

[codecov]

Codecov Report

Merging #428 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #428      +/-   ##
==========================================
+ Coverage   87.85%   87.86%   +0.01%     
==========================================
  Files          74       74              
  Lines        1959     1961       +2     
  Branches      213      213              
==========================================
+ Hits         1721     1723       +2     
  Misses        232      232              
  Partials        6        6              

Impacted Files	Coverage Δ
src/discord/services/discord.service.ts	92.30% <100.00%> (+0.64%)	⬆️

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