Add "Roll out" strategies to readme

Problem/Motivation

With the flexibility of this module there might be a few roll-out strategies.

1. Info gathering only - add rules but don't enable rules "on save" this will let you run the report to collect info and strategise
2. Soft start - create only a handful of the most important rules and turn them on as warnings. Gradually change a few rules at a time from warn into prevent.
3. Hardline - Turn it on, add a bunch of Prevent rules

Also document that the rules don't have to just be A11y focused, They could enforce brand strategy
Enforce confusing content experiences like VA being read by screen readers as "Virginia" when you wanted it to mean "Veteran's Affairs".

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes