[User Guide] Remove obsolete image

[imnasnainaec]

Follow-up to #3619

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.45%. Comparing base (33f97f7) to head (a1e3d58).
Report is 22 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3624   +/-   ##
=======================================
  Coverage   74.45%   74.45%           
=======================================
  Files         284      284           
  Lines       11048    11048           
  Branches     1354     1354           
=======================================
  Hits         8226     8226           
  Misses       2431     2431           
  Partials      391      391           

Flag	Coverage Δ
backend	83.88% <ø> (ø)
frontend	66.17% <ø> (ø)

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[andracc]

Reviewed 6 of 6 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)