misc: add jetbrain folder .idea to gitignore

[Synar]

Prevent files from jetbrain IDEs (datagrip, intellij, pycharm, webstorm, ...) from being tracked.

Jetbrain actually recommends part of the .idea folder to be shared via git and provides its own .gitignore for this purpose, but I'm not sure enough people use jetbrain in our project to warrant this.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.84%. Comparing base (8a2b4c9) to head (c8ff907).
Report is 2 commits behind head on dev.

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@@            Coverage Diff             @@
##              dev    #9740      +/-   ##
==========================================
- Coverage   37.85%   37.84%   -0.01%     
==========================================
  Files         990      990              
  Lines       90921    90921              
  Branches     1176     1176              
==========================================
- Hits        34415    34411       -4     
- Misses      56052    56056       +4     
  Partials      454      454              

Flag	Coverage Δ
editoast	73.27% <ø> (-0.02%)	⬇️
front	20.11% <ø> (ø)
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.74% <ø> (ø)

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[ElysaSrc]

Jetbrain actually recommends part of the .idea folder to be shared via git and provides its own .gitignore for this purpose, but I'm not sure enough people use jetbrain in our project to warrant this.

Let's not bother too much with this imho

[Khoyo]

You should probable add it to the .dockerignore and remove it from core/{.gitignore,.dockerignore}

[Synar]

You should probable add it to the .dockerignore and remove it from core/{.gitignore,.dockerignore}

Removed it from core/.gitignore, but I don't believe there is such a thing as a general .dockerignore

[Khoyo]

That's actually right, oh well