refactor(general): remove unused receiver

[julio-lopez]

No functional changes

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 77.04%. Comparing base (cb455c6) to head (9e898de).
Report is 124 commits behind head on master.

Files	Patch %	Lines
repo/content/content_manager.go	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3833      +/-   ##
==========================================
+ Coverage   75.86%   77.04%   +1.17%     
==========================================
  Files         470      479       +9     
  Lines       37301    28714    -8587     
==========================================
- Hits        28299    22122    -6177     
+ Misses       7071     4691    -2380     
+ Partials     1931     1901      -30     

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