Removed IonImg from vue's imports/exports (unused)

Tested all examples with and without the import as mentioned in `https://github.com/ionic-team/ionic-docs/issues/4095`. Components maintain full functionality without this import.

Author: kkindrai

static/usage/v8/infinite-scroll/basic/vue.md

@@ -23,7 +23,6 @@
     IonList,
     IonItem,
     IonAvatar,
-    IonImg,
     IonLabel,
     InfiniteScrollCustomEvent,
   } from '@ionic/vue';
@@ -37,7 +36,6 @@
       IonList,
       IonItem,
       IonAvatar,
-      IonImg,
       IonLabel,
     },
     setup() {

static/usage/v8/infinite-scroll/custom-infinite-scroll-content/vue.md

@@ -89,7 +89,6 @@
     IonList,
     IonItem,
     IonAvatar,
-    IonImg,
     IonLabel,
     InfiniteScrollCustomEvent,
   } from '@ionic/vue';
@@ -103,7 +102,6 @@
       IonList,
       IonItem,
       IonAvatar,
-      IonImg,
       IonLabel,
     },
     setup() {

static/usage/v8/infinite-scroll/infinite-scroll-content/vue.md

@@ -26,7 +26,6 @@
     IonList,
     IonItem,
     IonAvatar,
-    IonImg,
     IonLabel,
     InfiniteScrollCustomEvent,
   } from '@ionic/vue';
@@ -40,7 +39,6 @@
       IonList,
       IonItem,
       IonAvatar,
-      IonImg,
       IonLabel,
     },
     setup() {