v2.2.5 - Reorganize docs and clean project structure

Changed

• reorganized the main documentation for clearer onboarding and faster understanding
• clarified repository structure, official CLI flow, datasets, tests, and local artifacts
• aligned README, examples, scripts, experiments, and Makefile with the current official workflow
• expanded make clean to remove common local build, cache, coverage, docs, and result artifacts

Removed

• removed examples/xor_dataset.csv, which was no longer part of the official flow

Verification

• python -m rede_neural_do_zero verify --build-package
• 88 passed, 24 subtests passed
• mkdocs build --strict passed