refactor(post-meta): use build-in embed schema

[mydearxym]

No description provided.

[codecov]

Codecov Report

Merging #313 (b60132f) into dev (f303cb5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #313   +/-   ##
=======================================
  Coverage   87.22%   87.22%           
=======================================
  Files         111      111           
  Lines        1339     1339           
=======================================
  Hits         1168     1168           
  Misses        171      171           

Impacted Files	Coverage Δ
...groupher_server/cms/delegates/article_operation.ex	100.00% <ø> (ø)
lib/groupher_server/cms/post.ex	100.00% <ø> (ø)
lib/groupher_server_web/resolvers/cms_resolver.ex	93.54% <ø> (ø)
lib/groupher_server_web/schema/cms/cms_types.ex	0.00% <ø> (ø)

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