[Feature Request]: Rename MiniGrid References on documentation (Text-only)

### Preflight Checklist

- [x] I have read the [Contributing Guidelines](https://github.com/EnAccess/micropowermanager/blob/main/CONTRIBUTING.md) for this project, if it exists.
- [x] I agree to follow the [Code of Conduct](https://github.com/EnAccess/micropowermanager/blob/main/CODE_OF_CONDUCT.md) that this project adheres to.
- [x] I have searched the [issue tracker](https://github.com/EnAccess/micropowermanager/issues) for a feature request that matches the one I want to file, without success.

### Problem Description

Use this issue to address renaming all references to Minigrid on the documentation, starting with text references. Images should be left as is.

Sub-issue of #1363, to land on MPMv1.

### Proposed Solution

N/A

### Alternatives Considered

N/A

### Additional Information

_No response_