(Fix) error in step4 in netlify

[mariano-aguero]

Steps to build:

• $ git clone git@github.com:poanetwork/token-wizard.git token-wizard-build
• $ cd token-wizard-build
• $ git checkout fix-error-folders-in-build
• $ cp .env.example .env
• $ npm i (necessary for nps)
• $ npm run build
• $ serve -s build

The problem is because the build script clears the directory

[coveralls]

Pull Request Test Coverage Report for Build 3373

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 18.898%

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Totals
Change from base Build 3369:	0.0%
Covered Lines:	893
Relevant Lines:	4041

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💛 - Coveralls