[P3] Add CFP link to the sponsor tab in homepage

[palladius]

In homepage it says:

• Learn from some of the brightest minds in the Ruby community from Gallia Cisalpina atque Transalpina. [Coming Soon]

It should say something more like:

• Learn from some of the brightest minds in the Ruby community from Gallia Cisalpina atque Transalpina.
• Wanna apply for CFP and enter history? Check the /cfp page. (this should link to /cfp page of course)

[github-actions]

🤖 Hi @palladius, I've received your request, and I'm working on it now! You can track my progress in the logs for more details.

[palladius]

@gemini-cli please file a simple PR for this.

[github-actions]

🤖 Hi @palladius, I've received your request, and I'm working on it now! You can track my progress in the logs for more details.

[github-actions]

@palladius I've received your request and I'm working on it now! 🤖

[github-actions]

🤖 I'm sorry @palladius, but I was unable to process your request. Please see the logs for more details.

[github-actions]

I have added the CFP link to the homepage as requested. All changes have been committed.