docs: huntr no longer is offering a security bounty so remove it

[ntindle]

Huntr isn't offering a security bounty for autogpt at the moment so remove it in favor of github security adviosories

Changes 🏗️

comments out huntr line in case they decide to offer it again in the future

[qodo-merge-pro]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ No major issues detected

[github-actions]

This PR targets the master branch but does not come from dev or a hotfix/* branch.

Automatically setting the base branch to dev.

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[Pwuts]

Why did they stop? Out of money?

[ntindle]

no real answer was given but

Hey folks, we're rejigging our open source vulnerability programme to a tiered structure where the new top prize will exceed the previous one ($1500). The changes you see now are just a temporary stop gap until we roll out the tiered system. Since we're trying to break ground in AI/ML supply chain security we constantly have to make tweaks until we find a model that works for everybody. This specific change aims to better reward enterprise critical vulns while still maintaining our usual service for the other great vulns you find. We are working hard to roll out the changes before the holiday break. As always; all past bounties and promises will be honoured.