ci: remove broken drone CI and update badge

[inkydragon]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (1de2856) 81.90% compared to head (8beeb22) 81.90%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #179   +/-   ##
=======================================
  Coverage   81.90%   81.90%           
=======================================
  Files           1        1           
  Lines         442      442           
=======================================
  Hits          362      362           
  Misses         80       80           

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.