Move plugins to manifest, pin Docker version, add Makefile

- Add plugins.txt listing all plugins for reproducible installs
- Add Makefile with setup/start/stop/install-plugins targets
- Remove user/plugins/ from git tracking
- Pin Docker image to 1.7.49.5-ls244

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/email/vendor/symfony/mailer/README.md

@@ -1,74 +0,0 @@
-Mailer Component
-================
-
-The Mailer component helps sending emails.
-
-Getting Started
----------------
-
-```
-$ composer require symfony/mailer
-```
-
-```php
-use Symfony\Component\Mailer\Transport;
-use Symfony\Component\Mailer\Mailer;
-use Symfony\Component\Mime\Email;
-
-$transport = Transport::fromDsn('smtp://localhost');
-$mailer = new Mailer($transport);
-
-$email = (new Email())
-    ->from('hello@example.com')
-    ->to('you@example.com')
-    //->cc('cc@example.com')
-    //->bcc('bcc@example.com')
-    //->replyTo('fabien@example.com')
-    //->priority(Email::PRIORITY_HIGH)
-    ->subject('Time for Symfony Mailer!')
-    ->text('Sending emails is fun again!')
-    ->html('<p>See Twig integration for better HTML integration!</p>');
-
-$mailer->send($email);
-```
-
-To enable the Twig integration of the Mailer, require `symfony/twig-bridge` and
-set up the `BodyRenderer`:
-
-```php
-use Symfony\Bridge\Twig\Mime\BodyRenderer;
-use Symfony\Bridge\Twig\Mime\TemplatedEmail;
-use Symfony\Component\EventDispatcher\EventDispatcher;
-use Symfony\Component\Mailer\EventListener\MessageListener;
-use Symfony\Component\Mailer\Mailer;
-use Symfony\Component\Mailer\Transport;
-use Twig\Environment as TwigEnvironment;
-
-$twig = new TwigEnvironment(...);
-$messageListener = new MessageListener(null, new BodyRenderer($twig));
-
-$eventDispatcher = new EventDispatcher();
-$eventDispatcher->addSubscriber($messageListener);
-
-$transport = Transport::fromDsn('smtp://localhost', $eventDispatcher);
-$mailer = new Mailer($transport, null, $eventDispatcher);
-
-$email = (new TemplatedEmail())
-    // ...
-    ->htmlTemplate('emails/signup.html.twig')
-    ->context([
-        'expiration_date' => new \DateTime('+7 days'),
-        'username' => 'foo',
-    ])
-;
-$mailer->send($email);
-```
-
-Resources
----------
-
- * [Documentation](https://symfony.com/doc/current/mailer.html)
- * [Contributing](https://symfony.com/doc/current/contributing/index.html)
- * [Report issues](https://github.com/symfony/symfony/issues) and
-   [send Pull Requests](https://github.com/symfony/symfony/pulls)
-   in the [main Symfony repository](https://github.com/symfony/symfony)