feat: show past community events

Enable past events in the embedded OpenTechEvents widget.

Co-Authored-By: Codex <noreply@openai.com>

Author: hhkaos

src/pages/Index.tsx

@@ -531,6 +531,7 @@ const Index = () => {
               feed={eventsFeedUrl}
               limit="12"
               layout={eventsLayout}
+              show-past
               fields="image,when,location,attendance,description,tags,organizer"
               theme="light"
               lang={language}