stop tracking .idea folder

[dJani97]

What does this PR do?

Stopped tracking the .idea folder and removed it from the repository. Flutter's default .gitignore always excludes this folder, it is not necessary for Flutter or Dart and it's content changes based on local IDE settings.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (a fix or feature that would cause existing functionality to change)

Screenshots

If applicable, add screenshots to help explain your problem.

Checklist

• Directed the PR to develop branch and not the master branch
• Wrote additional tests, if needed
• All tests have passed
• I have updated the documentation accordingly, if needed.

[codecov-commenter]

Codecov Report

Merging #148 (21bd8ae) into develop (1c13ada) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #148   +/-   ##
========================================
  Coverage    93.72%   93.72%           
========================================
  Files           33       33           
  Lines         1322     1322           
========================================
  Hits          1239     1239           
  Misses          83       83           

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