Removed unnecessary setup section, duplicate

[dragosgd]

Purpose

Update SFT tutorial

Changes

• removed unnecessary setup section, it was not needed as user is already redirected in the index to our separate setup tutorial
• tutorial was mentioning that the cis2-nft was used, which is wrong, as cis2-multi was actually used, rectified this
• fixed one small typo
• this tutorial is not completed, code might have to be modified in the future in order to be up to date, still in review

Checklist

• My code follows the style of this project.
• The code compiles without warnings.
• I have performed a self-review of the changes.
• I have documented my code, in particular the intent of the
  hard-to-understand areas.
• (If necessary) I have updated the CHANGELOG.

CLA acceptance

By submitting the contribution I accept the terms and conditions of the
Contributor License Agreement v1.0

• link: https://developers.concordium.com/CLAs/Contributor-License-Agreement-v1.0.pdf

• I accept the above linked CLA.

[TinaKT]

Looks good