Allow to configure the timeout

Hello @jmaties, thanks for your work, please could you review the following changes I propose?

1. +++ b/go_wkhtmltox.links.menu.yml	2023-01-27 13:47:16
   @@ -0,0 +1,5 @@
   +  title: go_wkhtmltox settings
   

   Use module name instead of the machine name.

2. +++ b/go_wkhtmltox.links.menu.yml	2023-01-27 13:47:16
   @@ -0,0 +1,5 @@
   +  description: Configure go_wkhtmltox module.
   

   Use module name instead of the machine name.

3. +++ b/go_wkhtmltox.routing.yml	2023-01-26 18:27:17
   @@ -0,0 +1,7 @@
   +  path: /admin/config/system/go_wkhtmltox
   

   We should use "go-wkhtmltox" not "go_wkhtmltox" and move it under "services": /admin/config/services, update also the route definition.

4. +++ b/src/API/Resource/ConvertResource.php	2023-01-27 13:45:01
   @@ -50,6 +56,7 @@
   +    $this->configFactory = \Drupal::config('go_wkhtmltox.settings');
   

   We need to inject this service.

5. +++ b/src/API/Resource/ConvertResource.php	2023-01-27 13:45:01
   @@ -93,8 +100,7 @@
   +      'timeout' => $this->configFactory->get('timeout'),
   

   Use 15 as default value.

6. +++ b/src/Form/SettingsForm.php	2023-01-26 18:35:07
   @@ -0,0 +1,61 @@
   +      'go_wkhtmltox.settings',
   

   We need to add the module schema.

7. +++ b/src/Form/SettingsForm.php	2023-01-26 18:35:07
   @@ -0,0 +1,61 @@
   +    $form['timeout'] = [
   

   There are other settings:

   - endpoint
   - path