is_superuser -> is_staff

[0xAda]

Fixes #69

[codecov]

Codecov Report

Merging #88 (55bcf73) into master (d62ccb1) will increase coverage by 0.06%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
+ Coverage   90.51%   90.58%   +0.06%     
==========================================
  Files         169      169              
  Lines        4344     4343       -1     
  Branches      229      229              
==========================================
+ Hits         3932     3934       +2     
+ Misses        358      356       -2     
+ Partials       54       53       -1     

Impacted Files	Coverage Δ
src/polaris/client.py	38.70% <0.00%> (ø)
src/scorerecalculator/views.py	100.00% <ø> (ø)
src/config/views.py	62.06% <50.00%> (+6.89%)	⬆️
src/team/views.py	98.61% <100.00%> (ø)
src/config/config.py	84.00% <0.00%> (+4.00%)	⬆️

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[Bentechy66]

[0xAda]

this is done in #115