Migrated all [`invoke`](https://www.pyinvoke.org/) tasks to [`python-tools-scripts`](https://github.com/s0undt3ch/python-tools-scripts).

* `tasks/docs.py` -> `tools/precommit/docs.py`
* `tasks/docstrings.py` -> `tools/precommit/docstrings.py`
* `tasks/loader.py` -> `tools/precommit/loader.py`
* `tasks/filemap.py` -> `tools/precommit/filemap.py`
