Feature/remove rows

[acelaya]

Remove references to rows and cols, and use flex utilities to arrange elements positions.

[github-actions]

Preview environment

https://shlinkio.github.io/shlink-web-client/feature/remove-rows/

[codecov]

Codecov Report

Attention: Patch coverage is 94.59459% with 2 lines in your changes missing coverage. Please review.

Project coverage is 79.11%. Comparing base (723e869) to head (9094c1d).
Report is 5 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/common/NoMenuLayout.tsx	66.66%	0 Missing and 1 partial ⚠️
src/servers/ManageServers.tsx	90.90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1352   +/-   ##
========================================
  Coverage    79.11%   79.11%           
========================================
  Files           49       49           
  Lines         1264     1264           
  Branches       242      242           
========================================
  Hits          1000     1000           
  Misses          23       23           
  Partials       241      241           

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