remove unused endpoint

[umbynos]

Please check if the PR fulfills these requirements

• The PR has no duplicates (please search among the Pull Requests
  before creating one)
• Tests for the changes have been added (for bug fixes / features)

• What kind of change does this PR introduce?

remove unused endpoint

• What is the current behavior?

the killbrowser endpoint was used to kill the browser after the certificate installation

• What is the new behavior?

we do not need this endpoint anymore

• Does this PR introduce a breaking change?

technically yes, but the endpoint is unused

• Other information:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9d362b2) 19.68% compared to head (5c77a0c) 19.93%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #877      +/-   ##
==========================================
+ Coverage   19.68%   19.93%   +0.24%     
==========================================
  Files          46       44       -2     
  Lines        3672     3626      -46     
==========================================
  Hits          723      723              
+ Misses       2855     2809      -46     
  Partials       94       94              

Flag	Coverage Δ
unit	19.93% <ø> (+0.24%)	⬆️

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[alessio-perugini]

love it!