chore: revert open collective url changes, remove www subdomain

[Readpato]

🔗 Linked issue

Solves #135 comments

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• [x] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [x] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Reverts erroneous open collective links, removes www subdomain

📝 Checklist

• [x] I have linked an issue or discussion.
• [x] I have updated the documentation accordingly.

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[Wabri]

Thanks for reverting and sorry for the late review of the previous pr

[Readpato]

No problem, better later than never.

Merging this one!