Feature/ogc 3359 show topic hierarchy

[Tschuppi81]

Org: Adds view for topic hierarchy (information architecture)

TYPE: Feature
LINK: ogc-3359

[linear]

OGC-3359

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.75%. Comparing base (71573d6) to head (a2b3ab4).
⚠️ Report is 4 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

Files with missing lines	Coverage Δ
src/onegov/org/app.py	94.70% <100.00%> (+0.06%)	⬆️
src/onegov/org/custom.py	99.03% <100.00%> (+<0.01%)	⬆️
src/onegov/org/views/topic_chart.py	100.00% <100.00%> (ø)
src/onegov/town6/views/topic_chart.py	100.00% <100.00%> (ø)

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