Remove redundant nested API routes

[VMelnalksnis]

Changes proposed in this pull request:

• Remove redundant nested routes (Standartize transactions/accounts endpoints #300)

[codecov]

Codecov Report

Merging #423 (d1c0216) into master (a2ea406) will decrease coverage by 0.40%.
The diff coverage is 77.27%.

@@            Coverage Diff             @@
##           master     #423      +/-   ##
==========================================
- Coverage   64.75%   64.34%   -0.41%     
==========================================
  Files         251      256       +5     
  Lines        6861     6833      -28     
  Branches      535      518      -17     
==========================================
- Hits         4443     4397      -46     
- Misses       2261     2277      +16     
- Partials      157      159       +2     

Impacted Files	Coverage Δ
....Core/Transactions/Loans/LoanUpsertionViewModel.cs	25.53% <0.00%> (-0.56%)	⬇️
....Avalonia.Core/Transactions/Loans/LoanViewModel.cs	77.14% <0.00%> (ø)
...a.Core/Transactions/Purchases/PurchaseViewModel.cs	69.51% <0.00%> (ø)
...a.Core/Transactions/Transfers/TransferViewModel.cs	83.01% <0.00%> (ø)
...rce/Gnomeshade.Data/Repositories/LoanRepository.cs	92.85% <ø> (+2.85%)	⬆️
...Gnomeshade.Data/Repositories/PurchaseRepository.cs	100.00% <ø> (+5.26%)	⬆️
...Gnomeshade.Data/Repositories/TransferRepository.cs	92.85% <0.00%> (-7.15%)	⬇️
...WebApi/V1_0/Transactions/TransactionsController.cs	90.59% <ø> (-4.22%)	⬇️
...ansactions/Transfers/TransferUpsertionViewModel.cs	70.88% <33.33%> (-0.91%)	⬇️
...onia.Core/DesignTime/DesignTimeGnomeshadeClient.cs	73.70% <45.45%> (-0.57%)	⬇️
... and 19 more

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