Fix navigation and formatting in Build -> Smart Contracts (Move) -> Objects

Description

On https://aptos.dev/en/build/smart-contracts/objects/creating-objects, the sidebar table of contents is broken (due to the wrong headings used in the mdx file). This fixes the ToC and ensures correct headings are used.

Before

After

Another issue is that routing to the Objects page under the Addressable Storage section is broken. On clicking it, the page will navigate correctly, but the sidebar shows you in Object under Aptos Standards (they both use objects as the route). This fixes that issue by using the object path for the route under "Aptos Standards" and objects for the route under "Addressable Storage".

I added redirects for the old routes.

https://github.com/user-attachments/assets/1c6ded2f-ae11-4cc4-ae2c-317a347ced69

Checklist

Do all Lints pass?
- [x] Have you ran pnpm spellcheck?
- [x] Have you ran pnpm fmt?
- [x] Have you ran pnpm lint?

aptos-labs / developer-docs

Fix navigation and formatting in Build -> Smart Contracts (Move) -> Objects #680

Description

Before

After

Checklist