Cleaner left-hand table-of-contents for API reference

Looking at the HATS RTD, the menu options in the left-hand-side for the API reference have a lot of unnecessary duplication:

API reference
└── hats
    ├── hats.catalog
    ├── hats.inspection
    └── ...

I would really love if we could have it be simpler:

hats API reference
├── catalog
├── inspection
└── ... 

this includes the package name in the top-level, and omits the package name from the submodule names.

I don't even know if sphinx/autoapi supports this, but I can dream, right?

先找出 Read the Docs 文件中產生 API 參考的 Sphinx/AutoAPI 設定。檢查其選項是否能產生所要求的頂層套件名稱，以及較短的子模組標籤。當呈現後的左側導覽顯示「hats API reference」，並包含「catalog」和「inspection」等項目，且不重複套件名稱時，即表示完成。