Remove unused fxml files and the tournaments and tutorials tabs

[Sheikah45]

No description provided.

[codecov]

Codecov Report

Merging #2989 (ef39c32) into develop (bec19fc) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

❗ Current head ef39c32 differs from pull request most recent head c7950ec. Consider uploading reports for the commit c7950ec to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #2989      +/-   ##
=============================================
- Coverage      61.35%   61.35%   -0.01%     
+ Complexity      4599     4596       -3     
=============================================
  Files            557      557              
  Lines          20191    20184       -7     
  Branches        1048     1048              
=============================================
- Hits           12389    12384       -5     
+ Misses          7219     7214       -5     
- Partials         583      586       +3     

Impacted Files	Coverage Δ
.../com/faforever/client/chat/UrlPreviewResolver.java	0.00% <0.00%> (ø)
.../java/com/faforever/client/fx/BrowserCallback.java	14.28% <0.00%> (ø)
...java/com/faforever/client/main/MainController.java	51.75% <ø> (-1.26%)	⬇️

... and 2 files with indirect coverage changes

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