remove a duplicated page (#966)

### Description
before
![Screenshot 2025-06-03 at 10.35.11 AM.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/XVbPtMdqqe4K1PNnLQvf/8a0bfcfd-a81c-48b8-bb41-589c03cc236b.png)

after 
![Screenshot 2025-06-03 at 10.33.39 AM.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/XVbPtMdqqe4K1PNnLQvf/af7f00c0-c350-453d-90e8-d4a44e44af9c.png)


### Checklist
<!-- Read the Nextra Contributor's Guide here: https://aptos.dev/en/developer-platforms/contribute -->

- If any existing pages were renamed or removed:
  - [ ] Were redirects added to [next.config.mjs](../apps/nextra/next.config.mjs)?
  - [ ] Did you update any relative links that pointed to the renamed / removed pages?
- Do all Lints pass?
  - [x] Have you ran `pnpm fmt`?
  - [ ] Have you ran `pnpm lint`?

Author: yuunlimm