chore: clear outdated overlay demo (#11250)

Removes the old `Overlay` demo which isn't necessary anymore, because we've got a dedicated demo with more debugging controls. It also wasn't particularly useful, because we couldn't change anything and we couldn't close most of the overlays.

Author: crisbeto

src/demo-app/demo-app/demo-app.ts

@@ -71,7 +71,6 @@ export class DemoApp {
     {name: 'List', route: '/list'},
     {name: 'Live Announcer', route: '/live-announcer'},
     {name: 'Menu', route: '/menu'},
-    {name: 'Overlay', route: '/overlay'},
     {name: 'Paginator', route: '/paginator'},
     {name: 'Platform', route: '/platform'},
     {name: 'Portal', route: '/portal'},

src/demo-app/demo-app/demo-module.ts

@@ -38,12 +38,6 @@ import {InputDemo} from '../input/input-demo';
 import {ListDemo} from '../list/list-demo';
 import {LiveAnnouncerDemo} from '../live-announcer/live-announcer-demo';
 import {MenuDemo} from '../menu/menu-demo';
-import {
-  KeyboardTrackingPanel,
-  OverlayDemo,
-  RotiniPanel,
-  SpaghettiPanel
-} from '../overlay/overlay-demo';
 import {PlatformDemo} from '../platform/platform-demo';
 import {PortalDemo, ScienceJoke} from '../portal/portal-demo';
 import {ProgressBarDemo} from '../progress-bar/progress-bar-demo';
@@ -116,12 +110,10 @@ import {MaterialExampleModule} from '../example/example-module';
     IconDemo,
     InputDemo,
     JazzDialog,
-    KeyboardTrackingPanel,
     ListDemo,
     LiveAnnouncerDemo,
     MatCheckboxDemoNestedChecklist,
     MenuDemo,
-    OverlayDemo,
     PaginatorDemo,
     PlatformDemo,
     PortalDemo,
@@ -130,15 +122,13 @@ import {MaterialExampleModule} from '../example/example-module';
     RadioDemo,
     RainyTabContent,
     RippleDemo,
-    RotiniPanel,
     ScienceJoke,
     ScreenTypeDemo,
     SelectDemo,
     SidenavDemo,
     SlideToggleDemo,
     SliderDemo,
     SnackBarDemo,
-    SpaghettiPanel,
     StepperDemo,
     SunnyTabContent,
     TabsDemo,
@@ -157,10 +147,7 @@ import {MaterialExampleModule} from '../example/example-module';
     ExampleBottomSheet,
     IFrameDialog,
     JazzDialog,
-    KeyboardTrackingPanel,
-    RotiniPanel,
     ScienceJoke,
-    SpaghettiPanel,
   ],
 })
 export class DemoModule {

src/demo-app/demo-app/routes.ts

@@ -29,7 +29,6 @@ import {InputDemo} from '../input/input-demo';
 import {ListDemo} from '../list/list-demo';
 import {LiveAnnouncerDemo} from '../live-announcer/live-announcer-demo';
 import {MenuDemo} from '../menu/menu-demo';
-import {OverlayDemo} from '../overlay/overlay-demo';
 import {PlatformDemo} from '../platform/platform-demo';
 import {PortalDemo} from '../portal/portal-demo';
 import {ProgressBarDemo} from '../progress-bar/progress-bar-demo';
@@ -82,7 +81,6 @@ export const DEMO_APP_ROUTES: Routes = [
     {path: 'list', component: ListDemo},
     {path: 'live-announcer', component: LiveAnnouncerDemo},
     {path: 'menu', component: MenuDemo},
-    {path: 'overlay', component: OverlayDemo},
     {path: 'paginator', component: PaginatorDemo},
     {path: 'platform', component: PlatformDemo},
     {path: 'portal', component: PortalDemo},