Add limits to pipelines docs

Author: jonesphillip

src/content/docs/pipelines/platform/limits.mdx

@@ -5,7 +5,12 @@ sidebar:
   order: 2
 ---
 
-import { Render } from "~/components";
+While in open beta, the following limits are currently in effect:
 
-| Feature | Limit |
-| ------- | ----- |
+| Feature                                    | Limit  |
+| ------------------------------------------ | ------ |
+| Maximum streams per account                | 20     |
+| Maximum payload size per ingestion request | 1 MB   |
+| Maximum ingest rate per stream             | 5 MB/s |
+| Maximum sinks per account                  | 20     |
+| Maximum pipelines per account              | 20     |