The Quickstart link on the top page is a 404 error, but is it in progress?

### Checklist

- [x] the issue is indeed a bug and not a support request
- [x] issue doesn't already exist: https://github.com/kivy/python-for-android/issues

### Description
The Quickstart guide link on the top page is a 404 error
i can't start learn how to install to use this! :/
---
>## Documentation

>More information is available in the
>[online documentation](https://python-for-android.readthedocs.io) including a
>[quickstart guide](https://python-for-android.readthedocs.io/en/latest/quickstart/).

>python-for-android is managed by the [Kivy team](https://kivy.org).

The installation method was in the link above Is this what you are referring to?
[https://python-for-android.readthedocs.io/en/latest/quickstart.html]
The current link has no `.html` and does not automatically resolve it
I'm browser uses kiwi, Perhaps it's a server-side configuration issue?

same below in section `p4a troubleshooting documentation`
(https://buildozer.readthedocs.io/en/latest/installation.html)
so maybe readthedocs.io's server setting changed?

Open the Quickstart link on the top page and compare it with the working-looking URLs in the issue, including the `.html` variant and the troubleshooting documentation link. Check whether the failure is in the documentation link or Read the Docs routing. Done means the top-page Quickstart and related documentation links resolve successfully.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.