Update embed patch

[bast0006]

Now supports:

• passing None for color to make the color match the embed background
• passing content and description at the same time is handled better
• author field now supports users, members, and strings to just specify a name
• handle when an author doesn't have an avatar url

[codecov[bot]]

Codecov Report

Merging #84 (fd56427) into main (60efd62) will decrease coverage by 0.18%. The diff coverage is 28.57%.

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
- Coverage   33.25%   33.07%   -0.19%     
==========================================
  Files          17       17              
  Lines         893      898       +5     
  Branches      132      134       +2     
==========================================
  Hits          297      297              
- Misses        583      587       +4     
- Partials       13       14       +1     

Impacted Files	Coverage Δ
modmail/utils/embeds.py	81.57% <28.57%> (-12.37%)	:arrow_down:

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