Rename and re-organise custom modules

- Rename `opd_talks` to `opdavies_talks`
- Rename `custom` to `opdavies_blog`

web/modules/custom/opdavies_blog/hooks/node_links/alter.inc

@@ -0,0 +1,28 @@
+<?php
+
+/**
+ * @file
+ * Node links alter hooks.
+ */
+
+declare(strict_types=1);
+
+use Drupal\Core\Url;
+use Drupal\node\NodeInterface;
+
+/**
+ * Implements hook_node_links_alter().
+ */
+function opdavies_blog_node_links_alter(array &$links, NodeInterface $node): void {
+  if (!method_exists($node, 'getExternalLink')) {
+    return;
+  }
+
+  if ($link = $node->getExternalLink()) {
+    $links['node']['#links']['node-readmore']['url'] = Url::fromUri($link['uri']);
+    $links['node']['#links']['node-readmore']['title'] = t('Read more<span class="visually-hidden"> about @title</span> (<span class="visually-hidden">on </span>@domain)', [
+      '@domain' => $link['title'],
+      '@title' => $node->label(),
+    ]);
+  }
+}