building both the short and long paper

Upload illustrations of Harvey Norman example (SmartTokenLabs#65)

* Delete purchase-with-shipment-token.jpg, purchase-without-shipment-token.jpg and other outdated pictures.

* Upload illustrations of Harvey Norman example by emphasizing tokenisation

* Quoting the pictures in desgin_paper.md

restoring picture reference links

grammmarly did the "integrate the web" section

adding the example of AirBNB token