docs: fix current API keywords in usage examples

[dajiaohuang]

Package version (main branch)

1.2.1

Description

Correct documentation examples that currently raise TypeError because their keyword arguments no longer match the public APIs:

• README: ordinary_kriging(..., unknown_location=...) → unknown_locations=...; index the single returned row before describing its fields.
• IDW example: unknown_locations=... → unknown_location=....
• PointSupport examples: ps_blocks=BLOCKS → blocks=BLOCKS in the constructor examples across the API docstrings.
• README: point dependency information to the existing pyproject.toml, rather than nonexistent SETUP.md/setup.cfg, and correct test to tests.

No runtime behavior, signatures, models, dependencies, or license terms change.

Problem

Copying the current examples fails before interpolation/point-support construction. The README also shows a flat result although ordinary kriging returns one row per location.

Validation

• Installed the project with Python 3.13.8 on Windows.
• Executed README steps 2–5 with an invented, fixed-seed 24-point GeoDataFrame in place of the external dataset load, and the documented IDW/PointSupport call expressions with invented point/polygon data. Before: unsupported-keyword errors; after: all 19 selected expressions/snippets pass.
• Selected existing synthetic tests: pytest -q tests/test_idw/test_idw.py tests/test_core/test_points_data_models.py — 17 passed, one existing GeoPandas FutureWarning.
• Checked that all changed Python ASTs are identical after stripping docstrings; git diff --check passes.

Package check

• Full test suite: not run locally; validation was limited to synthetic fixtures and the affected documentation calls, without running bundled geographic/health-data fixtures or full notebooks.
• Documentation sources updated.
• All tutorials: not executed; generated Sphinx HTML not regenerated.

The synthetic checks validate these API examples, not the scientific accuracy of every interpolation method or a cross-platform test matrix.