Expand kitchen sink plugin demos

ui/src/App.tsx

@@ -155,6 +155,7 @@ function boardRoutes() {
       <Route path="inbox/new" element={<Navigate to="/inbox/recent" replace />} />
       <Route path="design-guide" element={<DesignGuide />} />
       <Route path="tests/ux/runs" element={<RunTranscriptUxLab />} />
+      <Route path=":pluginRoutePath" element={<PluginPage />} />
       <Route path="*" element={<NotFoundPage scope="board" />} />
     </>
   );