drop Action retrier from docs (#43634)

the action retrier is strictly less powerful than the workpool, so let's not mention it & confuse folks

GitOrigin-RevId: 1456a60fa03f4bd559d49aea55e47c47279e7b57

Author: ianmacartney

npm-packages/docs/docs/agents/workflows.mdx

@@ -210,12 +210,6 @@ import { ComponentCardList } from "@site/src/components/ComponentCard";
 
 <ComponentCardList
   items={[
-    {
-      title: "Action Retrier",
-      description:
-        "Add reliability to unreliable external service calls. Retry idempotent calls with exponential backoff until success.",
-      href: "https://www.convex.dev/components/retrier",
-    },
     {
       title: "Workpool",
       description:

npm-packages/docs/docs/scheduling.mdx

@@ -40,12 +40,6 @@ following higher-level [components](/components.mdx) for durable functions.
         "Simplify programming long running code flows. Workflows execute durably with configurable retries and delays.",
       href: "https://www.convex.dev/components/workflow",
     },
-    {
-      title: "Action Retrier",
-      description:
-        "Add reliability to an unreliable external service. Retry idempotent calls a set number of times.",
-      href: "https://www.convex.dev/components/retrier",
-    },
     {
       title: "Crons",
       description: