Adjust easy migration example content structure

I've made the example content more general. I used posts from accessibility.civicactions.com for the slice.

I've also removed the old example content type and started over -- the new content type is simple_content_migration. I removed the old migration yaml and cleaned up the example yaml.

QA Steps:

1. Disable the example module. ddev drush pmu ai_migration_example
2. Re-enable the module to create the new content type. ddev drush en -y ai_migration_example
3. Log in and go to admin/structure/types.
4. Confirm that simple_content_migration is in the list.
5. It is advisable to delete the old content type easy_migration_example.
6. Clear the cache. ddev drush cr
7. Run the import. ddev drush migrate:import simple_content_migration
8. Confirm that 2 items import.
9. Go to the content list and inspect the nodes.
10. Confirm that they imported adequately.

I get this error when trying to re-enable the module

dmundra in ~/workspace/community/ai_migration on branch 3545204-adjust-easy-migration > ddev drush en -y ai_migration_example

In UnmetDependenciesException.php line 100:
                                                                                                                                                                                                             
  Configuration objects provided by <em class="placeholder">ai_migration_example</em> have unmet dependencies: <em class="placeholder">field.field.node.simple_content_migration.field_author (field.storag  
  e.node.field_author), field.field.node.simple_content_migration.field_post_content (field.storage.node.field_post_content), field.field.node.simple_content_migration.field_post_date (field.storage.node  
  .field_post_date), field.field.node.simple_content_migration.field_publishing_information (field.storage.node.field_publishing_information)</em>                                                           
                                                                                                                                                                                                             

Failed to run drush en -y ai_migration_example: exit status 1

I did uninstall the module. Ah I believe you are missing the field.storage config files for those new fields.

Good catch @dmundra. I've added in the missing config and moved everything to a config/optional directory so that we can uninstall/enable the module without a configuration objects already exist in active configuration error (something that was occurring to me while testing this morning).

Looking good @majorrobot. I do like the prompt details in the field descriptions. For the byline should we grab the title if it exists? E.g. https://accessibility.civicactions.com/posts/prioritizing-accessibility-... has “By Jack Haas, Front End Engineer” (but that is for the future)

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