docs: remove Controlling Memory Ingestion cookbook, redirect to Custom Instructions (#6955)

docs/cookbooks/overview.mdx

@@ -35,7 +35,7 @@ Every cookbook opens with a **Works with** badge naming the SDK surface it uses.
     | [Memory-Powered Support Agent](/cookbooks/operations/support-inbox) | Operations | OSS only |
   </Tab>
   <Tab title="Hosted Platform">
-    Twenty-one cookbooks run on the hosted Platform, using `MemoryClient` or the Mem0 MCP server with a `MEM0_API_KEY`.
+    Twenty cookbooks run on the hosted Platform, using `MemoryClient` or the Mem0 MCP server with a `MEM0_API_KEY`.
 
     | Cookbook | Category | Works with |
     | --- | --- | --- |
@@ -43,7 +43,6 @@ Every cookbook opens with a **Works with** badge naming the SDK surface it uses.
     | [Research Assistant for YouTube](/cookbooks/companions/youtube-research) | Companions | Platform only |
     | [Voice-First AI Companion](/cookbooks/companions/voice-companion-openai) | Companions | Platform only |
     | [Build a Companion with Mem0](/cookbooks/essentials/building-ai-companion) | Essentials | OSS and Platform |
-    | [Control Memory Ingestion](/cookbooks/essentials/controlling-memory-ingestion) | Essentials | Platform only |
     | [Export Stored Memories](/cookbooks/essentials/exporting-memories) | Essentials | Platform only |
     | [Partition Memories by Entity](/cookbooks/essentials/entity-partitioning-playbook) | Essentials | Platform only |
     | [Tag and Organize Memories](/cookbooks/essentials/tagging-and-organizing-memories) | Essentials | Platform only |
@@ -97,11 +96,18 @@ The most popular cookbooks to get going fast:
     Balance personalization with consistent behavior across users, agents, and apps.
   </Card>
   <Card
-    title="Control Memory Ingestion"
-    icon="filter"
-    href="/cookbooks/essentials/controlling-memory-ingestion"
+    title="Tag and Organize Memories"
+    icon="tags"
+    href="/cookbooks/essentials/tagging-and-organizing-memories"
   >
-    Filter speculation and low-confidence data.
+    Use categories to keep retrieval fast and audits simple.
+  </Card>
+  <Card
+    title="Export Memories"
+    icon="download"
+    href="/cookbooks/essentials/exporting-memories"
+  >
+    Back up, migrate, and audit stored memory data.
   </Card>
 </CardGroup>