add website

Add link to documentation website for overview.

Author: denisecase

profile/README.md

@@ -17,6 +17,8 @@ legal, political, scientific, or normative frameworks.
 This organization contains specifications, formalizations, and papers
 that define, justify, and defend that neutral space.
 
+The [documentation website](https://structural-explainability.github.io/site/) offers a more general overview. 
+
 ## Roles
 
 This organization is structured around roles: