[frontend] change app routing /exercises to /simulations (#1940)

[guillaumejparis]

Proposed changes

Related issues

• Closes Simulations context - Rename 'exercices' in URL for 'simulations #1940

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.62%. Comparing base (f4b3d9c) to head (d910560).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1944   +/-   ##
=========================================
  Coverage     33.62%   33.62%           
  Complexity     1671     1671           
=========================================
  Files           572      572           
  Lines         16697    16697           
  Branches        970      970           
=========================================
  Hits           5614     5614           
  Misses        10829    10829           
  Partials        254      254           

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