Update getContentItems to return total count and items

The changes involved modifying the implementation of `getContentItems` across multiple files, specifically in the CMS-related codebase. This method now returns an object containing the total count of items and the items themselves. The updates also included necessary adjustments in the code where `getContentItems` is called to accommodate the new structure of the returned result.

apps/web/app/(marketing)/docs/page.tsx

@@ -18,12 +18,12 @@ async function DocsPage() {
   const client = await createCmsClient();
   const { t } = await createI18nServerInstance();
 
-  const docs = await client.getContentItems({
+  const { items } = await client.getContentItems({
     collection: 'documentation',
   });
 
   // Filter out any docs that have a parentId, as these are children of other docs
-  const cards = docs.filter((item) => !item.parentId);
+  const cards = items.filter((item) => !item.parentId);
 
   return (
     <PageBody>
@@ -33,7 +33,7 @@ async function DocsPage() {
           subtitle={t('marketing:documentationSubtitle')}
         />
 
-        <div className={'flex flex-col items-center'}>
+        <div className={'container mx-auto flex flex-col items-center'}>
           <DocsCards cards={cards} />
         </div>
       </div>