RF: organize - should no longer alter dandiset.yaml

[yarikoptic]

We will just rely on users to populate it online without providing them
with any assistance locally since we do not upload dandiset.yaml
anyways.

Discussion/observation which triggered this change: #614 (comment)

[codecov]

Codecov Report

Merging #615 (46dbe88) into master (0288e6a) will decrease coverage by 0.20%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #615      +/-   ##
==========================================
- Coverage   84.10%   83.89%   -0.21%     
==========================================
  Files          59       59              
  Lines        5717     5701      -16     
==========================================
- Hits         4808     4783      -25     
- Misses        909      918       +9     

Flag	Coverage Δ
unittests	83.89% <50.00%> (-0.21%)	⬇️

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Impacted Files	Coverage Δ
dandi/tests/test_organize.py	93.60% <ø> (ø)
dandi/cli/cmd_organize.py	76.87% <50.00%> (-0.43%)	⬇️
dandi/organize.py	85.76% <0.00%> (-6.54%)	⬇️
dandi/_version.py	45.96% <0.00%> (+1.75%)	⬆️

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[yarikoptic]

thank you @jwodder for the review, let's proceed