docs(landing): drop the duplicated idleTimeLimit

Every cast header already carries idle_time_limit 2.0; repeating it in the
player config is a second answer to one question, and the one that drifts is
whichever is not the cast. Found reviewing against design-principles "a
derivation done twice is the defect".

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/index.html

@@ -184,7 +184,9 @@ nix profile install github:fiddlerwoaroof/improvise
         AsciinemaPlayer.create(
           `./casts/${name}.cast`,
           document.getElementById(`cast-${name}`),
-          { cols: 120, rows: 37, theme: "monokai", autoPlay: false, loop: true, idleTimeLimit: 2 },
+          // No idleTimeLimit: every cast header already carries 2.0, and a
+          // second spelling of it here is a second answer to one question.
+          { cols: 120, rows: 37, theme: "monokai", autoPlay: false, loop: true },
         );
       }
     </script>