Simplify documentation and link examples from the API

[dcajal]

Summary

• simplify the README, landing page, feature overview, and persistent contributor guidance
• remove the standalone Examples section and its per-example documentation pages
• link each of the nine executable example scripts from its corresponding API page
• remove implementation-history wording from public example descriptions

Impact

The API remains the single Python reference. Users can move directly from a function signature and docstring to executable source without maintaining a second explanatory page for each example.

Validation

• .venv\Scripts\python.exe -m pytest (220 passed)
• .venv\Scripts\python.exe -m mkdocs build --strict
• verified nine API links for nine executable example scripts
• git diff --check