chore: remove install.gnogenesis from root makefile

[thehowl]

Follow-up to #3041.

Not even gnoland is part of the core commands in the root makefile, hence it makes no sense for gnogenesis to be one of them.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.10%. Comparing base (2a2be39) to head (7b716cb).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3045   +/-   ##
=======================================
  Coverage   63.09%   63.10%           
=======================================
  Files         548      548           
  Lines       78514    78514           
=======================================
+ Hits        49541    49547    +6     
+ Misses      25627    25623    -4     
+ Partials     3346     3344    -2     

Flag	Coverage Δ
contribs/gnodev	60.57% <ø> (ø)
contribs/gnofaucet	15.77% <ø> (ø)
gno.land	63.82% <ø> (ø)
gnovm	67.87% <ø> (ø)
misc/genstd	79.72% <ø> (ø)
tm2	62.32% <ø> (-0.10%)	⬇️

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