src/app/item-page: adjust grid in simple item view

The Bootstrap grid is composed of 12 columns, but we are not using
the entire grid, which could lead to unexpected stacking depending
on the viewport size. This also allows more horizontal space to be
used by text-heavy content like abstracts and citations.

Author: alanorth

src/app/item-page/simple/item-types/publication/publication.component.html

@@ -54,7 +54,7 @@
       [label]="'publication.page.publisher'">
     </ds-generic-item-page-field>
   </div>
-  <div class="col-12 col-md-7">
+  <div class="col-12 col-md-8">
     <ds-related-items
       [parentItem]="object"
       [relationType]="'isProjectOfPublication'"

src/app/item-page/simple/item-types/untyped-item/untyped-item.component.html

@@ -55,7 +55,7 @@
       [label]="'item.page.publisher'">
     </ds-generic-item-page-field>
   </div>
-  <div class="col-12 col-md-6">
+  <div class="col-12 col-md-8">
     <ds-item-page-abstract-field [item]="object"></ds-item-page-abstract-field>
     <ds-generic-item-page-field [item]="object"
       [fields]="['dc.description']"