fix: avoid exiting as Tokio needs to manage open threads. Fix typo

[Angelmmiguel]

Properly manage errors when running commands by using the Result return value. Before, I was exiting the CLI earlier and that was causing the app to panik. The reason is that, Actix uses Tokio under the hood for managing async code. Tokio need to manage the entire application to ensure the threads are properly finished. By exiting early, we force the program to panik.

I also fixed a small typo.

Result

./wws install ruby latest
⚙️  Fetching data from the repository...
🚀 Installing the runtime...
❌ There was an error installing the runtime from the repository
👉 The checksums don't match
Error: Custom { kind: InvalidData, error: "" }

I couldn't remove the "Error: Custom" message for now. However, this is much better than the previous output so I'll investigate why this is happening in a future version.

It closes #96

[Angelmmiguel]

Since I plan to revisit how to improve this in the future, I will merge these changes.