Rename custom module directories

- Rename `opdavies_blog` to `blog`.
- Rename `opdavies_blog_test` to `blog_test`.
- Rename `opdavies_talks` to `talks`.
- Rename `opdavies_talks_test` to `talks_test`.

The files within the directories haven't changed, so there is no
breaking change caused by renaming the directories.

 Please enter the commit message for your changes. Lines starting

web/modules/custom/opdavies_talks/tests/src/Kernel/UpdatesTalkCreatedDateTest.php

@@ -1,45 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Drupal\Tests\opdavies_talks\Kernel;
-
-use Carbon\Carbon;
-use Drupal\datetime\Plugin\Field\FieldType\DateTimeItemInterface;
-
-final class UpdatesTalkCreatedDateTest extends TalksTestBase {
-
-  public function testCreatingNode() {
-    $eventDate = Carbon::today()->addWeek();
-    $eventDateFormat = $eventDate
-      ->format(DateTimeItemInterface::DATE_STORAGE_FORMAT);
-    $eventDateTimestamp = $eventDate->getTimestamp();
-
-    $talk = $this->createTalk([
-      'field_events' => [
-        $this->createEvent(['field_date' => $eventDateFormat]),
-      ],
-    ]);
-
-    $this->assertEqual($eventDateTimestamp, $talk->getCreatedTime());
-  }
-
-  public function testUpdatingNode() {
-    $talk = $this->createTalk();
-    $originalCreatedTime = $talk->getCreatedTime();
-
-    $eventDate = Carbon::today()->addWeek();
-    $eventDateFormat = $eventDate
-      ->format(DateTimeItemInterface::DATE_STORAGE_FORMAT);
-    $eventDateTimestamp = $eventDate->getTimestamp();
-
-    $talk->addEvent(
-      $this->createEvent(['field_date' => $eventDateFormat])
-    );
-    $talk->save();
-
-    $this->assertNotSame($originalCreatedTime, $talk->getCreatedTime());
-    $this->assertSame($eventDateTimestamp, $talk->getCreatedTime());
-  }
-
-}