fix: hide unavailable Twins Lab demo

lib/site-content.test.ts

@@ -98,3 +98,9 @@ it("resolves every declared related case ID", () => {
 
   expect(unresolved).toEqual([]);
 });
+
+it("does not publish the unavailable Twins Lab demo", () => {
+  expect(
+    caseStudies.find((item) => item.id === "twins-lab")?.demoUrl,
+  ).toBeUndefined();
+});

lib/site-content.ts

@@ -536,7 +536,6 @@ export const caseStudies: CaseStudyContent[] = [
     impact:
       "Expor estados simulados do reator a uma interface autenticada e manter histórico/status do simulador.",
     stack: ["Next.js", "TypeScript", "NextAuth", "MongoDB", "SSE"],
-    demoUrl: "https://twins.evandro.dev.br",
     githubUrl: "https://github.com/evandrodevbr/twins-lab",
     detail: {
       answer: {