Small different UI improvements

Show the cursor as pointer on stock overview page while hovering the product name cell to highlight that the productcard can be opened
Show a waiting cursor and disable all form inputs while doing background XHR calls to highlight that the user should wait
Place the search field (to search a table) on all pages to the left most place

public/css/grocy.css

@@ -160,6 +160,14 @@ input::-webkit-inner-spin-button {
 	margin-right: 0;
 }
 
+.cursor-link {
+	cursor: pointer;
+}
+
+.cursor-busy {
+	cursor: wait;
+}
+
 /* Third party component customizations - DataTables */
 td {
      vertical-align: middle !important;