ci(github): fix build script in packages/cacti-ledger-browser

[ruzell22]

Description

The current react build scripts are not at all producing the structure of the ./dist folder that we need when running yarn run configure and yarn run custom-checks.

Refer to this comment for test and discussion: #3706 (comment)

Acceptance Criteria

1. Build script of the package is producing the expected structure of ./dist folder
2. yarn run custom-checks is running successfully and is passing on this specific package with no error