feat: article document concept

[mydearxym]

No description provided.

[codecov]

Codecov Report

Merging #409 (8f43d79) into dev (df4a280) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #409   +/-   ##
=======================================
  Coverage   86.93%   86.93%           
=======================================
  Files          59       59           
  Lines        1079     1079           
=======================================
  Hits          938      938           
  Misses        141      141           

Impacted Files	Coverage Δ
lib/groupher_server/cms/cms.ex	97.56% <ø> (ø)
lib/groupher_server_web/schema/cms/cms_types.ex	0.00% <ø> (ø)
lib/groupher_server/cms/delegates/article_curd.ex	100.00% <100.00%> (ø)
test/support/conn_simulator.ex	100.00% <100.00%> (ø)

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