declanns miscellaneous models

🏡 to some miscellaneous calculang models ✨🎁

Some notebooks 📓:

• calcudonuts 🍩💫
• some SaaS cashflows 💸
• more in my ObservableHQ collection

There are many more models constructed/under construction in the [models](./models/) folder.

⚠️ No financial advice or warranty etc. 🙃