fix: login redirect not working properly after component refactor

[fmartingr]

Bug introduced in #1017

The login component was not properly handling the dst parameter, and the backend was redirecting to the (now non-existant) /logjn route.

Modified the backend to properly redirect to / when the user is not authenticated and added dst parameter support to the login component.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.35%. Comparing base (0b745c1) to head (61c700d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1044      +/-   ##
==========================================
+ Coverage   34.28%   34.35%   +0.07%     
==========================================
  Files          61       61              
  Lines        5393     5399       +6     
==========================================
+ Hits         1849     1855       +6     
  Misses       3320     3320              
  Partials      224      224              

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