The URL for "Fee Structure" link in the Readme does not exist

[MBadea17]

Describe the bug
The URL provided in this text - "Introduce an advanced Fee Structure both for Market and Provider runners" - under the Flexibility header in the Readme does not exist.

To Reproduce

1. Open https://github.com/oceanprotocol/contracts#flexibility

2. Click on the following link:
   Introduce an advanced Fee Structure both for Market and Provider runners.

Expected behavior
The link opens this URL: https://docs.oceanprotocol.com/core-concepts/fees