fixed broken links (#6553)

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## PR-Codex overview
This PR focuses on updating documentation and modifying the sidebar structure in the `Nebula` application, including changes to links and adding a new FAQ section.

### Detailed summary
- Added a new FAQ section in `faqs/page.mdx` about using Nebula in a stateless manner.
- Changed the sidebar entry from `MCP Server` to `MCP Clients` in `sidebar.tsx`.
- Updated the link for `Examples` in `sidebar.tsx` to point to a GitHub repository.

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Author: saminacodes

apps/portal/src/app/nebula/faqs/page.mdx

@@ -46,6 +46,10 @@ The context size or window is 128k tokens or approximately 96,000 words which ma
 Nebula is not currently open source. We are exploring open sourcing Nebula in the future.
 </Details>
 
+<Details summary="Can Nebula be used in a stateless manner?"> 
+Depending on the use case, Nebula can be used in a stateless manner by not reusing the same session. Nebula learns from each session, so having more contextual requests will be beneficial and are recommended.
+</Details>
+
 <Details summary="When will pricing be available for Nebula?"> 
 Pricing options will be available in beta. Nebula is still being tested in alpha.
 </Details>

apps/portal/src/app/nebula/mcp-server/integrations/claude-desktop/page.mdx

@@ -1,6 +1,5 @@
 # Claude Desktop
 
-
 Learn how to add the MCP server to Claude Desktop:
 
 1. Install the MCP: `pipx install thirdweb-mcp`

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

@@ -172,8 +172,8 @@ export const sidebar: SideBar = {
               href: "/nebula/mcp-server/integrations/claude-desktop",
             },
             {
-              name: "MCP Server",
-              href: "/nebula/mcp-server/integrations/mcp-server",
+              name: "MCP Clients",
+              href: "/nebula/mcp-server/integrations/mcp-clients",
             },
           ],
         },
@@ -185,7 +185,6 @@ export const sidebar: SideBar = {
       links: [
         {
           name: "Python SDK",
-          href: "/nebula/tools/python-sdk",
           icon: <Code />,
           links: [
             {
@@ -194,7 +193,7 @@ export const sidebar: SideBar = {
             },
             {
               name: "Examples",
-              href: "/nebula/tools/python-sdk/examples",
+              href: "https://github.com/thirdweb-dev/ai/tree/main/python/examples",
             },
           ],
         },