Gracefully Update Space Acres

Mentioned by @kidtrailer in Discord, we need a smoother upgrade mechanism that allows users to update Space Acres without requiring a full reinstall. **Possible Solutions** 1. Implement a self-updating mechanism to streamline the update process. **Potential Approaches** Use the self_update crate ([GitHub repo](https://github.com/jaemk/self_update)) **Considerations** 1. Users should retain control over whether they update or not. 2. Possible cross-platform challenges since different OS handle updates differently. A pop-up similar to the one for Iterm has good example functionality. <img width="699" alt="Image" src="https://github.com/user-attachments/assets/c04e77e0-9cc1-4948-b941-a392c2c3811f" />