Add side nav link to ai docs in insight (#5885)

---
title: "[SDK/Dashboard/Portal] Feature/Fix: Concise title for the changes"
---

If you did not copy the branch name from Linear, paste the issue tag here (format is TEAM-0000):

## Notes for the reviewer
Anything important to call out? Be sure to also clarify these in your comments.

## How to test
Unit tests, playground, etc.

<!-- start pr-codex -->

---

## PR-Codex overview
This PR focuses on adding a new entry to the sidebar in the `sidebar.tsx` file of the `insight` section, specifically introducing a link for "Agents & LLMs".

### Detailed summary
- Added a new sidebar entry:
  - `name`: "Agents & LLMs"
  - `href`: `${insightSlug}/agents-and-llms`

> ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your question}`

<!-- end pr-codex -->

Author: AmineAfia

apps/portal/src/app/insight/sidebar.tsx

@@ -25,6 +25,10 @@ export const sidebar: SideBar = {
       name: "Use cases",
       href: `${insightSlug}/use-cases`,
     },
+    {
+      name: "Agents & LLMs",
+      href: `${insightSlug}/agents-and-llms`,
+    },
     {
       name: "API Reference",
       href: "https://insight-api.thirdweb.com/reference",