Additional conformance bullets for the Silver explainer

Jeanne, all,

For the Silver explainer<https://w3c.github.io/silver/guidelines/explainer.html>, I suggest the following addition to the section 3.3 Goals for Conformance, as a new numbered item:

Develop a more flexible conformance model that addresses the challenges in applying the 2.x conformance model to large, complex, and dynamic websites and web applications <<this could be a link to https://w3c.github.io/wcag/conformance-challenges/ if not the publish location https://www.w3.org/TR/wcag-conformance-challenges/.>

Peter
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Peter Korn | Director, Accessibility | Amazon Lab126
pkorn@amazon.com