Remove any mention of "Incentivised Testnet" from the website

[boulder225]

🎯 Problem to be solved

The website currently displays information about an "Incentivised Testnet", which is inaccurate or outdated. This information might lead to confusion or misinterpretation among users or visitors to the site.

🛠️ Proposed solution

• [ ] Remove or update the incorrect information about the "Incentivised Testnet" from the website.