docs: strip the decoration off the readme

Out: the centred div, the wall of shield badges, the hand-written bar of anchor
links, and the rule under the intro. None of it said anything the page did not
already say further down, and together they read as packaging rather than as a
description of the part.

In: a plain title, the one line saying what the thing is, and the
continuous-integration badge, which is the only one that reports something a
reader cannot get from the text. The opening figures stay exactly as they were,
separated by commas rather than middots, because the family's own checks read
those numbers and so does anybody deciding whether to keep reading.

Author: gufranco

README.md

@@ -1,31 +1,10 @@
-<div align="center">
+# SNES DSP Family
 
-<h1>SNES DSP Family</h1>
-
-<strong>The NEC uPD77C25 as Nintendo shipped it, running the microcode you supply rather than a description of it.</strong>
-
-<br>
-<br>
+The NEC uPD77C25 as Nintendo shipped it, running the microcode you supply rather than a description of it.
 
 [![CI](https://github.com/gufranco/snes-dsp-python/actions/workflows/ci.yml/badge.svg)](https://github.com/gufranco/snes-dsp-python/actions/workflows/ci.yml)
-[![Coverage](https://img.shields.io/badge/coverage-100%25%20statement%20%2B%20branch-brightgreen)](#tests)
-[![Python](https://img.shields.io/badge/python-3.12%20%7C%203.13%20%7C%203.14-blue)](pyproject.toml)
-[![Types](https://img.shields.io/badge/mypy-strict-blue)](pyproject.toml)
-[![License](https://img.shields.io/badge/license-MIT-blue)](LICENSE)
-
-</div>
-
-<p align="center">
-  <a href="#quick-start">Quick start</a> &nbsp;|&nbsp;
-  <a href="#the-family">The family</a> &nbsp;|&nbsp;
-  <a href="#why-there-is-no-model-here">Why there is no model</a> &nbsp;|&nbsp;
-  <a href="#the-microcode-you-supply">The microcode you supply</a> &nbsp;|&nbsp;
-  <a href="#driving-it-the-way-a-console-does">Driving it</a> &nbsp;|&nbsp;
-  <a href="#what-is-checked-without-one">What is checked without one</a> &nbsp;|&nbsp;
-  <a href="https://github.com/gufranco/snes-dsp-python/issues">Issues</a>
-</p>
 
-**6** parts across **5** microcodes · **1** processor underneath them all · **0** commands described by hand · **112** exchanges read out of **36** real cartridges compared, **0** failures · **849** tests · **100%** statement and branch coverage · **strict** types throughout · every image confirmed by **SHA-256** before a byte of it runs · no dependencies
+**6** parts across **5** microcodes, **1** processor underneath them all, **0** commands described by hand, **112** exchanges read out of **36** real cartridges compared, **0** failures, **849** tests, **100%** statement and branch coverage, **strict** types throughout, every image confirmed by **SHA-256** before a byte of it runs, no dependencies
 
 ```python
 from snesdsp import Chip
@@ -41,7 +20,6 @@ for byte in (0x02, 0x00, 0x03, 0x00):
 # [6, 0, 0, 0]
 ```
 
----
 
 ## Install
 ```bash