chore(ui5-avatar): sample with responsive images

packages/website/docs/_samples/main/Avatar/WithImage/sample.html

@@ -12,19 +12,19 @@
     <!-- playground-fold-end -->
 
     <ui5-avatar fallback-icon="employee" size="XS">
-        <img alt="Woman" src="../assets/images/avatars/woman_avatar_1.png" />
+        <img srcset="../assets/images/avatars/woman_avatar_32.png 1x, ../assets/images/avatars/woman_avatar_64.png 2x, ../assets/images/avatars/woman_avatar_96.png 3x" src="../assets/images/avatars/woman_avatar_64.png" alt="Woman" />
     </ui5-avatar>
     <ui5-avatar fallback-icon="employee" size="S">
-        <img alt="Woman" src="../assets/images/avatars/woman_avatar_1.png" />
+        <img srcset="../assets/images/avatars/woman_avatar_48.png 1x, ../assets/images/avatars/woman_avatar_96.png 2x, ../assets/images/avatars/woman_avatar_144.png 3x" src="../assets/images/avatars/woman_avatar_96.png" alt="Woman" />
     </ui5-avatar>
     <ui5-avatar fallback-icon="employee" size="M">
-        <img alt="Woman" src="../assets/images/avatars/woman_avatar_1.png" />
+        <img srcset="../assets/images/avatars/woman_avatar_64.png 1x, ../assets/images/avatars/woman_avatar_128.png 2x, ../assets/images/avatars/woman_avatar_192.png 3x" src="../assets/images/avatars/woman_avatar_128.png" alt="Woman" />
     </ui5-avatar>
     <ui5-avatar fallback-icon="employee" size="L">
-        <img alt="Woman" src="../assets/images/avatars/woman_avatar_1.png" />
+        <img srcset="../assets/images/avatars/woman_avatar_80.png 1x, ../assets/images/avatars/woman_avatar_160.png 2x, ../assets/images/avatars/woman_avatar_240.png 3x" src="../assets/images/avatars/woman_avatar_160.png" alt="Woman" />
     </ui5-avatar>
     <ui5-avatar fallback-icon="employee" size="XL">
-        <img alt="Woman" src="../assets/images/avatars/woman_avatar_1.png" />
+        <img srcset="../assets/images/avatars/woman_avatar_112.png 1x, ../assets/images/avatars/woman_avatar_224.png 2x, ../assets/images/avatars/woman_avatar_336.png 3x" src="../assets/images/avatars/woman_avatar_224.png" alt="Woman" />
     </ui5-avatar>
 
     <!-- playground-fold -->