Adds dashboard with ticket, page and news figures

[Tschuppi81]

Town6: Adds a dashboard with some basic figures

TYPE: Feature
LINK: ogc-1528

Checklist

• I have performed a self-review of my code
• I considered adding a reviewer
• I have added an upgrade hint such as data migration commands to be run
• I have updated the PO files
• I have added new modules to the docs
• I made changes/features for both org and town6
• I have updated the election_day API docs
• I have tested my code thoroughly by hand
  • I have tested styling changes/features on different browsers
  • I have tested javascript changes/features on different browsers
  • I have tested database upgrades
  • I have tested sending mails
  • I have tested building the documentation
• I have added tests for my changes/features
  • I am using freezegun for tests depending on date and times
  • I considered using browser tests für javascript changes/features
  • I have added/updated jest tests for d3rendering (election_day, swissvotes)

[linear]

OGC-1528 Dashboard Instanz

[codecov]

Codecov Report

Attention: Patch coverage is 17.18750% with 106 lines in your changes missing coverage. Please review.

Project coverage is 85.05%. Comparing base (821ff43) to head (50187a7).
Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
src/onegov/town6/boardlets.py	8.69%	105 Missing ⚠️
src/onegov/org/models/dashboard.py	87.50%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
src/onegov/org/custom.py	100.00% <100.00%> (ø)
src/onegov/org/directives.py	94.80% <100.00%> (+0.06%)	⬆️
src/onegov/ticket/model.py	84.61% <100.00%> (+0.21%)	⬆️
src/onegov/town6/theme/town_theme.py	92.00% <ø> (-8.00%)	⬇️
src/onegov/org/models/dashboard.py	95.34% <87.50%> (-1.88%)	⬇️
src/onegov/town6/boardlets.py	8.69% <8.69%> (ø)

... and 204 files with indirect coverage changes

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