Draft: Show articles a group has published

[DrumsnChocolate]

depends on csvalpha/amber-api#377
fixes #744
This looks something like this:

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.

Project coverage is 13.64%. Comparing base (88bd19c) to head (a8918e7).
Report is 8 commits behind head on staging.

Files with missing lines	Patch %	Lines
app/controllers/application/group-memberships.js	0.00%	16 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging     #775      +/-   ##
===========================================
- Coverage    13.79%   13.64%   -0.15%     
===========================================
  Files          450      448       -2     
  Lines         3067     3071       +4     
===========================================
- Hits           423      419       -4     
- Misses        2644     2652       +8     

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