refactor(cms): remove post topic concept

[mydearxym]

No description provided.

[codecov]

Codecov Report

Merging #326 (20b0aae) into dev (1de1a89) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #326   +/-   ##
=======================================
  Coverage   87.15%   87.15%           
=======================================
  Files         107      107           
  Lines        1331     1331           
=======================================
  Hits         1160     1160           
  Misses        171      171           

Impacted Files	Coverage Δ
lib/groupher_server/cms/cms.ex	97.56% <ø> (ø)
lib/groupher_server/cms/delegates/article_curd.ex	100.00% <ø> (ø)
lib/groupher_server/cms/post.ex	100.00% <ø> (ø)
lib/groupher_server/cms/tag.ex	100.00% <ø> (ø)
lib/groupher_server_web/schema/cms/cms_types.ex	0.00% <ø> (ø)
lib/helper/query_builder.ex	88.09% <ø> (ø)
...groupher_server/cms/delegates/article_operation.ex	100.00% <100.00%> (ø)
...ib/groupher_server/cms/delegates/community_curd.ex	100.00% <100.00%> (ø)
lib/groupher_server_web/resolvers/cms_resolver.ex	93.54% <100.00%> (ø)
... and 8 more

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