Refactor startup

[onerandomusername]

• chore: [temp fix] add members intent
• [launch]: refactor bot creation and bot run
• chore: make status update on_ready

Closes #57

[codecov]

Codecov Report

Merging #56 (8cf2202) into main (cbacff0) will decrease coverage by 1.42%.
The diff coverage is 28.26%.

@@            Coverage Diff             @@
##             main      #56      +/-   ##
==========================================
- Coverage   36.92%   35.49%   -1.43%     
==========================================
  Files          12       12              
  Lines         520      555      +35     
  Branches       60       64       +4     
==========================================
+ Hits          192      197       +5     
- Misses        323      352      +29     
- Partials        5        6       +1     

Impacted Files	Coverage Δ
modmail/__main__.py	57.14% <ø> (+10.08%)	⬆️
modmail/bot.py	32.72% <28.26%> (-10.33%)	⬇️

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