Update connectors-api.md (#1158)

Link in call out is unavailable; rewriting with links to relevant docs.

Author: myronkaifung

reference/Connectors API/connectors-api.md

@@ -7,4 +7,11 @@ updatedAt: "2023-05-22T22:10:13.776Z"
 ---
 > ❗️ Cloud Import
 > 
-> This API is now in maintenance mode and we are not accepting any new projects, please visit our legacy docs [here](https://developer.mixpanel.com/v2.60/reference/connectors-api) if you are using it.
+> This API is now in maintenance mode and we are not accepting any new projects. We strongly recommend using the cloud ingestion methods outlined in the guides below:
+> [Amazon S3](https://docs.mixpanel.com/docs/tracking-methods/integrations/amazon-s3)
+> [Google Pubsub](https://docs.mixpanel.com/docs/tracking-methods/integrations/google-pubsub)
+> [Google Cloud Storage](https://docs.mixpanel.com/docs/tracking-methods/integrations/google-cloud-storage)
+> [Snowplow](https://docs.mixpanel.com/docs/tracking-methods/integrations/snowplow)
+> [Stripe](https://docs.mixpanel.com/docs/tracking-methods/integrations/stripe)
+>
+> It is easy to integrate Mixpanel even if you use tools that we don't explicitly list here, like Spark, Airflow, Prefect, Dagster, or Kafka. Ultimately, all of these ingestion methods boil down to hitting our simple, scalable [HTTP APIs](https://developer.mixpanel.com/reference/ingestion-api) using the tools that you're most familiar with.