Frontend organizations and reactions

[an2508374]

Updates provided by this pull request:

• adjusting organization components to work properly after last updates of Organizations Service
• adding option of filtering events by selecting an organization (and then we get events organized by all organizations in the subtree of the chosen one)
• adding functionalities provided by Reactions Service (which works quite well, it was a smooth experience)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.63%. Comparing base (42862e6) to head (7c331ff).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #157   +/-   ##
=======================================
  Coverage   33.63%   33.63%           
=======================================
  Files          65       65           
  Lines         877      877           
  Branches       82       82           
=======================================
  Hits          295      295           
  Misses        560      560           
  Partials       22       22           

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