deprecated and redirected docs (#7960)

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## PR-Codex overview
This PR primarily focuses on removing several files related to the `infrastructure` section of the application, including markdown files, images, and TypeScript components, while also updating the `redirects.mjs` file to include new external portal redirects.

### Detailed summary
- Deleted the following files:
  - `apps/portal/src/app/infrastructure/page.mdx`
  - `apps/portal/src/app/infrastructure/layout.tsx`
  - `apps/portal/src/app/infrastructure/sidebar.tsx`
  - `apps/portal/src/app/infrastructure/assets/test.jpg`
  - `apps/portal/src/app/infrastructure/storage/overview/page.mdx`
  - `apps/portal/src/app/infrastructure/rpc-edge/overview/page.mdx`
  - `apps/portal/src/app/infrastructure/rpc-edge/get-started/page.mdx`
  - `apps/portal/src/app/infrastructure/storage/how-storage-works/page.mdx`
  - `apps/portal/src/app/infrastructure/rpc-edge/get-started/assets/api-key.png`
  - `apps/portal/src/app/infrastructure/rpc-edge/overview/assets/rpc-diagram.svg`
  - `apps/portal/src/app/infrastructure/rpc-edge/get-started/assets/public-rpcs.png`
  - `apps/portal/src/app/infrastructure/rpc-edge/get-started/assets/usage-dashboard.png`
  - `apps/portal/src/app/infrastructure/storage/how-to-use-storage/host-web-app/page.mdx`
  - `apps/portal/src/app/infrastructure/storage/how-storage-works/assets/storage-diagram.svg`
  - `apps/portal/src/app/infrastructure/storage/how-to-use-storage/upload-files-to-ipfs/page.mdx`
  - `apps/portal/src/app/infrastructure/storage/how-to-use-storage/upload-files-to-ipfs/assets/storage-urls.png`
  - `apps/portal/src/app/infrastructure/storage/how-to-use-storage/upload-files-to-ipfs/assets/storage-upload.png`
  - `apps/portal/src/app/infrastructure/storage/how-to-use-storage/upload-files-to-ipfs/assets/storage-dashboard.png`
- Updated `apps/portal/redirects.mjs` to:
  - Redirect `"/storage/upload-to-ipfs"` to `"/infrastructure/storage/how-to-use-storage/upload-files-to-ipfs"`
  - Add infrastructure redirects to external portal links for `"/infrastructure/storage/:path*"` and `"/infrastructure/rpc-edge/:path*"`

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<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

- Documentation
  - Removed the Infrastructure section from the portal, including Overview, Storage (Overview, How Storage Works, Upload Files to IPFS, Host Web App), and RPC Edge (Overview, Get Started) pages.
  - Updated navigation accordingly to reflect the removal of these pages.

- New Features
  - Added automatic redirects for Infrastructure content:
    - /infrastructure/storage/:path* now points to the external Storage documentation.
    - /infrastructure/rpc-edge/:path* now points to the external RPC documentation.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: saminacodes

apps/portal/redirects.mjs

@@ -865,6 +865,11 @@ const infrastructureRedirects = {
   "/storage/how-storage-works": "/infrastructure/storage/how-storage-works",
   "/storage/upload-to-ipfs":
     "/infrastructure/storage/how-to-use-storage/upload-files-to-ipfs",
+  // infrastructure redirects to external portal
+  "/infrastructure/storage/:path*":
+    "https://portal.thirdweb.com/references/typescript/v5/functions#storage",
+  "/infrastructure/rpc-edge/:path*":
+    "https://portal.thirdweb.com/references/typescript/v5/functions#rpc",
 };
 
 const glossaryRedirects = {