fix: remove unnecessary example

src/Plugin/api_proxy/G2Crowd.php

-<?php
-
-namespace Drupal\api_proxy\Plugin\api_proxy;
-
-use Drupal\api_proxy\Annotation\HttpApi;
-use Drupal\api_proxy\Plugin\HttpApiPluginBase;
-use Drupal\Core\Annotation\Translation;
-use Drupal\Core\Form\SubformStateInterface;
-use Symfony\Component\HttpFoundation\Response;
-
-/**
- * @HttpApi(
- *   id = "g2-crowd",
- *   label = @Translation("G2 Crowd"),
- *   description = @Translation("Proxies requests to the G2 Crowd API."),
- *   serviceUrl = "https://data.g2.com/api/v1",
- * )
- */
-final class G2Crowd extends HttpApiPluginBase {
-
-  use HttpApiCommonConfigs;
-
-  /**
-   * {@inheritdoc}
-   */
-  public function addMoreConfigurationFormElements(array $form, SubformStateInterface $form_state): array {
-    $configuration = $this->configuration;
-    return array_merge(
-      $form,
-      ['auth_token' => $this->authTokenConfigForm($configuration)]
-    );
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function calculateHeaders(array $headers): array {
-    $configuration = $this->getConfiguration();
-    $header = sprintf('Token token=%s', $configuration['auth_token'] ?? '');
-    return array_merge(
-      parent::calculateHeaders($headers),
-      ['Authorization' => $header]
-    );
-  }
-
-  public function changeOutputFromApi(Response $response): Response {
-    $response->headers->remove('transfer-encoding');
-    return $response;
-  }
-
-}