Clean up release instructions and coverage handling

[blink1073]

No description provided.

[codecov]

Codecov Report

Base: 80.35% // Head: 85.16% // Increases project coverage by +4.81% 🎉

Coverage data is based on head (e9e2096) compared to base (a50dd7c).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1098      +/-   ##
==========================================
+ Coverage   80.35%   85.16%   +4.81%     
==========================================
  Files          68      124      +56     
  Lines        8297    13095    +4798     
  Branches     1652        0    -1652     
==========================================
+ Hits         6667    11153    +4486     
- Misses       1199     1942     +743     
+ Partials      431        0     -431     

Impacted Files	Coverage Δ
jupyter_server/nbconvert/handlers.py	28.18% <0.00%> (-50.91%)	⬇️
jupyter_server/services/shutdown.py	76.92% <0.00%> (-23.08%)	⬇️
jupyter_server/utils.py	67.59% <0.00%> (-16.76%)	⬇️
jupyter_server/services/contents/fileio.py	76.84% <0.00%> (-13.16%)	⬇️
jupyter_server/_tz.py	94.11% <0.00%> (-5.89%)	⬇️
jupyter_server/extension/application.py	70.92% <0.00%> (-2.21%)	⬇️
jupyter_server/serverapp.py	79.15% <0.00%> (-0.89%)	⬇️
jupyter_server/terminal/__init__.py
jupyter_server/base/zmqhandlers.py
jupyter_server/terminal/handlers.py
... and 104 more

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