[skip-changelog] Remove go.mod from docsgen

[umbynos]

docsgen/go.mod, is not needed, it just replicates the content of the root go.mod

Similar to arduino/arduino-cli#2100

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.92%. Comparing base (b961277) to head (8fe4b1d).
Report is 72 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #170      +/-   ##
==========================================
- Coverage   11.00%   10.92%   -0.08%     
==========================================
  Files          21       22       +1     
  Lines        1827     1839      +12     
==========================================
  Hits          201      201              
- Misses       1567     1579      +12     
  Partials       59       59              

Flag	Coverage Δ
unit	10.92% <ø> (-0.08%)	⬇️

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