Compress images in build version

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npm install --global imagemin-cli
imagemin src/assets/images/* --out-dir=dist/angular-bvbmedia/assets/images/

To automate this process add the following lines to package.json:

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"build": "ng build --prod"
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"postbuild": "imagemin src/assets/images/* --out-dir=dist/angular-bvbmedia/assets/images/"

And from now build the project by running the npm command:

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npm run build