fix: incorrect paths in config docs

[jonnochoo]

From my experience the default paths for DAGU_LOG_DIR and DAGU_DATA_DIR are incorrect?

Not sure about DAGU_ADMIN_LOG_DIR...

If I'm wrong, feel free to close this PR :)

[yottahmd]

Great catch! thanks for the fix! :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.80%. Comparing base (2e627d8) to head (dee4f97).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #713   +/-   ##
=======================================
  Coverage   61.80%   61.80%           
=======================================
  Files          53       53           
  Lines        5249     5249           
=======================================
  Hits         3244     3244           
  Misses       1751     1751           
  Partials      254      254           

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