Update page background and add sharing

Change the entire page background to a subtle green upon successful completion of the rules of inference puzzle. Add share links and a unique URL for direct access to the interactive.

src/pages/theme-pages/discrete-math/Foundations.tsx

@@ -59,7 +59,7 @@ const interactives: Interactive[] = [{
   description: "Practice applying resolution and equivalence rules to derive conclusions step by step.",
   tags: ["logic", "proofs", "inference", "resolution", "deduction"],
   component: RulesOfInferencePlayground,
-  greenScreenPath: "/themes/discrete-math/foundations"
+  greenScreenPath: "/discrete-math/foundations/rules-of-inference"
 }];
 const Foundations = () => {
   const [searchTerm, setSearchTerm] = useState("");