Update LICENSE and remove redundant files 📜🗑️

- Updated `LICENSE.md` to reflect the year 2024.
- Deleted `MANIFEST.in`, removing file inclusion declarations.
- Cleaned up `README.md`, removing outdated sections.
- Removed Sphinx documentation: `doc/Makefile`, `conf.py`, `examples.rst`,
`functions.rst`, `index.rst`, `install.rst`, `make.bat`.
- Deleted `requirements.txt`, as it is no longer necessary.

Embrace the zen of simplicity! 🌟

Author: horta

LICENSE.md

@@ -1,7 +1,7 @@
 The MIT License (MIT)
 =====================
 
-Copyright (c) `2018` `Danilo Horta`
+Copyright (c) `2024` `Danilo Horta`
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in

MANIFEST.in

@@ -28,16 +28,6 @@ From command line, enter
 pip install brent-search
 ```
 
-## Testing
-
-```python
-python -c "import brent_search; brent_search.test()"
-```
-
-## Documentation
-
-[Documentation](https://brent-search.readthedocs.io/en/latest/)
-
 ## Authors
 
 * [Danilo Horta](https://github.com/horta)