fix: rename types.d.ts to types.ts

[danielroe]

🔗 Linked issue

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation or readme)
• [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)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

These are just a few quick refactors to rename the types.d.ts to types.ts file. (It doesn't seem to be written as a declaration file, and it's being imported from directly as well.) Drop me a DM if it would be helpful; I'm sure there are areas I've not properly tested but everything still seems to be working.

📝 Checklist

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