Fix caching problem + update dependencies

[makomweb]

• fix caching problem when generating the report PDF
• add Rector and let it run to consolidate the code base
• better Makefile targets for updating NPM packages (maintenance) + running Rector

[codecov]

Codecov Report

❌ Patch coverage is 59.25926% with 44 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.28%. Comparing base (834bfee) to head (6feaa0a).
⚠️ Report is 22 commits behind head on master.

Files with missing lines	Patch %	Lines
backend/src/Controller/API/ReportController.php	41.17%	10 Missing ⚠️
backend/src/Async/GenerateReportHandler.php	0.00%	7 Missing ⚠️
...ackend/src/Controller/Admin/UserCrudController.php	0.00%	6 Missing ⚠️
...ckend/src/Controller/Admin/EventCrudController.php	16.66%	5 Missing ⚠️
backend/src/Async/MessageHandler.php	0.00%	2 Missing ⚠️
backend/src/Command/ReportsCleanupCommand.php	0.00%	2 Missing ⚠️
...ckend/src/Controller/Admin/DashboardController.php	0.00%	2 Missing ⚠️
backend/src/DataFixtures/AppFixtures.php	0.00%	2 Missing ⚠️
backend/src/Repository/EventRepository.php	77.77%	2 Missing ⚠️
backend/src/Command/AddUserCommand.php	0.00%	1 Missing ⚠️
... and 5 more

Additional details and impacted files

@@              Coverage Diff              @@
##             master      #17       +/-   ##
=============================================
+ Coverage     37.52%   52.28%   +14.76%     
- Complexity      313      316        +3     
=============================================
  Files            58       58               
  Lines           994      962       -32     
=============================================
+ Hits            373      503      +130     
+ Misses          621      459      -162     

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