Fix: refactor base path settings, correct logout redirect

[shamoon]

Proposed change

Closes #5974

Type of change

• Bug fix: non-breaking change which fixes an issue.
• New feature / Enhancement: non-breaking change which adds functionality. Please read the important note above.
• Breaking change: fix or feature that would cause existing functionality to not work as expected.
• Documentation only.
• Other. Please explain:

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have included testing coverage for new code in this PR, for backend and / or front-end changes.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.97%. Comparing base (a698791) to head (bc1e1e1).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #5976   +/-   ##
=======================================
  Coverage   96.97%   96.97%           
=======================================
  Files         408      408           
  Lines       16246    16249    +3     
  Branches     1179     1178    -1     
=======================================
+ Hits        15754    15757    +3     
  Misses        492      492           

Flag	Coverage Δ
backend	95.70% <100.00%> (+<0.01%)	⬆️
frontend	98.48% <ø> (ø)

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[github-actions]

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