docs: link the generated API reference from the README

[adilfaisal01]

What

The API reference is already deployed to GitHub Pages (PR #20, workflow run 34995467734 — success), but nothing in the repo points at it. This adds the link.

Live now: https://shinro-xyz.github.io/shinro-python-modules/

Changes

README.md — two additions:

1. A badge under the title, so it's visible on the repo landing page:

[![API Reference](https://img.shields.io/badge/API%20Reference-shinro--xyz.github.io-blue)](https://shinro-xyz.github.io/shinro-python-modules/)

2. An entry in the existing Documentation section, right after the docs.shinro.xyz guides, describing what it covers and noting it's generated:

API Reference — https://shinro-xyz.github.io/shinro-python-modules/
Every exported symbol — the five ABCs, controllers, estimators, plants, trajectories, factories, utilities — with signatures, parameter tables and source links. Generated from the package's own __all__ on every push, so it cannot go stale.

mkdocs.yml — sets site_url, which was unset. Canonical URLs, the generated sitemap, and search relevance all depend on it.

Placement note

I put this alongside the docs.shinro.xyz links rather than replacing them — they're different things:

• docs.shinro.xyz — hand-written conceptual/operational guides
• GitHub Pages — generated per-symbol API reference

Happy to merge them onto one domain later, but that's a separate decision.

Verification

Check	Result
Live page	HTTP 200, title Home - shinro
Diff vs main	2 files, no collateral
Commit parent	origin/main (a50a2cb)

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