Resize Jupyter images to fit within the parent box

Large output images in Jupyter Notebooks were stretching
to their full width, rather than fitting within the parent
box

Changelog: changed
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/68654

app/assets/javascripts/blob/notebook/notebook_viewer.vue

@@ -77,3 +77,9 @@ export default {
     </p>
   </div>
 </template>
+
+<style>
+.output img {
+  min-width: 0; /* https://www.w3.org/TR/css-flexbox-1/#min-size-auto */
+}
+</style>