doc(narugo): replace all the pip install waifuc

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (a141efe) 67.32% compared to head (02ba8ab) 67.32%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #9 +/- ## ======================================= Coverage 67.32% 67.32% ======================================= Files 42 42 Lines 2069 2069 ======================================= Hits 1393 1393 Misses 676 676 ``` | [Flag](https://app.codecov.io/gh/deepghs/waifuc/pull/9/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepghs) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/deepghs/waifuc/pull/9/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepghs) | `67.32% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=deepghs#carryforward-flags-in-the-pull-request-comment) to find out more.

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