remove trailing slash from api proxy route

[hillalex]

Fixes #20 by removing the trailing slash from the nginx proxy_pass config. The easiest way to avoid uris being decoded as they are passed to the proxied service is by removing the trailing slash, which means uris will be passed along exactly as they are to the API. This does mean that the API itself needs to serve routes that look like /api/whatever . PR
for this change in the API: seroanalytics/serovizr#14. This seemed like a safer fix than trying to write a custom rewrite directive. See this SO answer for details.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.83%. Comparing base (f891080) to head (31ee7dd).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #21   +/-   ##
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  Coverage   98.83%   98.83%           
=======================================
  Files          30       30           
  Lines         688      688           
  Branches      131      131           
=======================================
  Hits          680      680           
  Misses          8        8           

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