Review 00 Intro / 03 Output (english version)

[brauliodiez]

Assigned to Carmen.

Try to follow the 03 output step by step guide, and correct / enrich the readme.md associated to that sample.

[crsanti]

The last picture is not being displayed. Url should change to:
../../99 Readme Resources/02 Webpack/Demo03_Minified.png "Demo03_Minified.png"