[documentation] the Russian documentation is broken.

[Koooooo-7]

Bug Report

Steps to reproduce

1. Visit documentation https://docsify.js.org and change to the translation Russian.
2. Click sidebar to another selection.

What is current behaviour

404 - Not found .

What is the expected behaviour

Open the right links.

Other relevant information

the router is mismatch.
The sidebar link is <a href="#/ru-ru/cover">Обложка</a>.
The title link rendered is <a href="#/ru/cover">Обложка</a>.

• Bug does still occur when all/other plugins are disabled?

• Your OS:

• Node.js version:

• npm/yarn version:

• Browser version:

• Docsify version:

• Docsify plugins:

Please create a reproducible sandbox

Mention the docsify version in which this bug was not present (if any)