build: update README to indicate that source has moved and delete all files

[parthea]

Towards googleapis/google-cloud-python#11047

[snippet-bot]

Here is the summary of changes.

You are about to delete 8 region tags.

• samples/generated_samples/ids_v1_generated_ids_create_endpoint_async.py:26, tag ids_v1_generated_IDS_CreateEndpoint_async
• samples/generated_samples/ids_v1_generated_ids_create_endpoint_sync.py:26, tag ids_v1_generated_IDS_CreateEndpoint_sync
• samples/generated_samples/ids_v1_generated_ids_delete_endpoint_async.py:26, tag ids_v1_generated_IDS_DeleteEndpoint_async
• samples/generated_samples/ids_v1_generated_ids_delete_endpoint_sync.py:26, tag ids_v1_generated_IDS_DeleteEndpoint_sync
• samples/generated_samples/ids_v1_generated_ids_get_endpoint_async.py:26, tag ids_v1_generated_IDS_GetEndpoint_async
• samples/generated_samples/ids_v1_generated_ids_get_endpoint_sync.py:26, tag ids_v1_generated_IDS_GetEndpoint_sync
• samples/generated_samples/ids_v1_generated_ids_list_endpoints_async.py:26, tag ids_v1_generated_IDS_ListEndpoints_async
• samples/generated_samples/ids_v1_generated_ids_list_endpoints_sync.py:26, tag ids_v1_generated_IDS_ListEndpoints_sync

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