Remove unneeded webpacker/react install command from Makefile

[icarito]

Command was needed at installation time only.

Fixes #0000 (<=== Add issue number here)

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[gitpod-io]

[icarito]

#9176 This references the webpack installation issue we faced previously.

[icarito]

@jywarren @noi5e I wonder if #9392 was really necessary too?

[codecov]

Codecov Report

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@@           Coverage Diff           @@
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  Lines           ?     5938           
  Branches        ?        0           
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  Hits            ?     4840           
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[icarito]

Cool! Remember to merge before deploying.

[icarito]

Actually I'll merge it!

[codeclimate]

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