feat(gotify): add support for gotify URL path

[piksel]

fixes #126

[codecov]

Codecov Report

Merging #127 (753b185) into main (84ec2ed) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
+ Coverage   59.96%   60.03%   +0.06%     
==========================================
  Files          55       55              
  Lines        1184     1186       +2     
==========================================
+ Hits          710      712       +2     
  Misses        424      424              
  Partials       50       50              

Impacted Files	Coverage Δ
pkg/services/gotify/gotify.go	73.33% <100.00%> (ø)
pkg/services/gotify/gotify_config.go	88.23% <100.00%> (+1.56%)	⬆️

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